UNESCO Look up UNESCO at Dictionary.com
acronym from United Nations Educational, Scientific and Cultural Organization, which was created in 1945.
unethical (adj.) Look up unethical at Dictionary.com
1871, from un- (1) "not" + ethical. Related: Unethically.
uneven (adj.) Look up uneven at Dictionary.com
Old English unefen "unequal, unlike, anomalous, irregular," from un- (1) "not" + even (adj.). Similar formation in Old Frisian oniovn, Middle Dutch oneven, Old High German uneban, German uneben, Old Norse ujafn. Meaning "broken, rugged" (in reference to terrain, etc.) is recorded from late 13c. Related: Unevenly; unevenness.
uneventful (adj.) Look up uneventful at Dictionary.com
1800, from un- (1) "not" + eventful. Related: Uneventfully.
unevitable (adj.) Look up unevitable at Dictionary.com
from un- (1) "not" + evitable. The usual word is inevitable. Related: Unevitably.
unexamined (adj.) Look up unexamined at Dictionary.com
late 15c., from un- (1) "not" + past participle of examine (v.).
unexceptionable (adj.) Look up unexceptionable at Dictionary.com
1660s, from un- (1) "not" + exceptionable.
unexceptional (adj.) Look up unexceptional at Dictionary.com
from un- (1) "not" + exceptional (adj.).
unexcusable (adj.) Look up unexcusable at Dictionary.com
late 14c., from un- (1) "not" + excusable. The usual word is inexcusable. Related: Unexcusably.
unexpected (adj.) Look up unexpected at Dictionary.com
1580s, from un- (1) "not" + past participle of expect (v.). Related: Unexpectedly.
unexperienced (adj.) Look up unexperienced at Dictionary.com
1560s, from un- (1) "not" + past participle of experience (v.).
unexplainable (adj.) Look up unexplainable at Dictionary.com
1711, from un- (1) "not" + explain + -able. Related: Unexplainably.
unexplained (adj.) Look up unexplained at Dictionary.com
1721, from un- (1) "not" + past participle of explain (v.).
unexplored (adj.) Look up unexplored at Dictionary.com
1690s, from un- (1) "not" + past participle of explore (v.).
unexpurgated (adj.) Look up unexpurgated at Dictionary.com
1882, from un- (1) "not" + past participle of expurgate (v.).
unfading (adj.) Look up unfading at Dictionary.com
from un- (1) "not" + past participle of fade (v.).
unfailing (adj.) Look up unfailing at Dictionary.com
late 14c., "never coming to an end, unceasing, everlasting, inexhaustible," from un- (1) "not" + present participle of fail (v.). Related: Unfailingly.
unfair (adj.) Look up unfair at Dictionary.com
Old English unfægr "unlovely, not beautiful, deformed, hideous, unlovable," from un- (1) "not" + fair (adj.). Similar formation in Old Norse ufagr, Gothic unfagrs. Meaning "wicked, evil, bad" is recorded from c. 1300. Sense of "not equitable, unjust" is first recorded 1713. Related: Unfairly.
unfairness (n.) Look up unfairness at Dictionary.com
Old English unfægernes "ugliness, disfigurement;" see unfair + -ness.
unfaithful (adj.) Look up unfaithful at Dictionary.com
mid-14c., "acting falsely," from un- (1) "not" + faithful. In Middle English it also had a sense of "infidel, unbelieving, irreligious" (late 14c.). Sense of "not faithful in marriage" is attested from 1828. Related: Unfaithfully; unfaithfulness.
unfaltering (adj.) Look up unfaltering at Dictionary.com
1660s, from un- (1) "not" + present participle of falter (v.). Related: Unfalteringly.
unfamiliar (adj.) Look up unfamiliar at Dictionary.com
1590s, from un- (1) "not" + familiar (adj.). Related: Unfamiliarly; unfamiliarity.
unfamous (adj.) Look up unfamous at Dictionary.com
late 14c., "not well known, obscure," from un- (1) "not" + famous (adj.). Also from late 14c. as "notably bad," a sense now in infamous.
unfashionable (adj.) Look up unfashionable at Dictionary.com
1560s, "incapable of being shaped," from un- (1) "not" + fashionable. Meaning "not in accordance with prevailing fashion" is attested from 1640s. Related: Unfashionably.
unfasten (v.) Look up unfasten at Dictionary.com
early 13c., from un- (2) "opposite of" + fasten. Old English had unfæstnian "to unfasten." Related: Unfastened; unfastening.
unfathomable (adj.) Look up unfathomable at Dictionary.com
1610s, originally in the figurative sense, of feelings, conditions, etc., from un- (1) "not" + fathomable. Literal sense attested from 1670s. Related: Unfathomably.
unfathomed (adj.) Look up unfathomed at Dictionary.com
1620s, from un- (1) "not" + past participle of fathom (v.).
unfavorable (adj.) Look up unfavorable at Dictionary.com
also unfavourable, mid-15c. (implied in unfavorably), from un- (1) "not" + favorable (adj.).
"We must not indulge in unfavorable views of mankind, since by doing it we make bad men believe that they are no worse than others, and we teach the good that they are good in vain." [Walter Savage Landor, "Imaginary Conversations"]
unfazed (adj.) Look up unfazed at Dictionary.com
1933, American English, from un- (1) "not" + past participle of faze (v.).
unfeasible (adj.) Look up unfeasible at Dictionary.com
1520s, from un- (1) "not" + feasible.
unfeeling (adj.) Look up unfeeling at Dictionary.com
late Old English had unfelende, "having no sensation." Middle English had a verb unfeel "be insensible, fail to feel" (early 14c.) as well as unfeelingness "insensibility, loss of sensation," and unfeelingly "without understanding or direct knowledge" (late 14c.), and a verbal noun unfeeling "loss of sensation, lack of feeling." However the word in its main modern meaning "devoid of kindly or tender feelings" is from 1590s, from un- (1) "not" + past participle of feel (v.). Related: Unfeelingly.
unfeigned (adj.) Look up unfeigned at Dictionary.com
late 14c., "sincere, genuine, true, real," from un- (1) "not" + past participle of feign (v.).
unfelt (adj.) Look up unfelt at Dictionary.com
1580s, from un- (1) "not" + past participle of feel (v.).
unfetter (v.) Look up unfetter at Dictionary.com
mid-14c., from un- (2) "opposite of" + fetter (v.). The figurative sense is recorded from late 14c. Related: Unfettered; unfettering.
unfinished (adj.) Look up unfinished at Dictionary.com
1550s, from un- (1) "not" + past participle of finish (v.).
unfit (adj.) Look up unfit at Dictionary.com
1540s, "not suitable" (in reference to things), from un- (1) "not" + fit (adj.). Related: Unfitness. In reference to persons or human qualities, attested from 1550s.
unfit (v.) Look up unfit at Dictionary.com
"to render unfit," 1610s, from unfit (adj.), or else from un- (2) "reverse of" + fit (v.). Related: Unfitted; unfitting.
unflagging (adj.) Look up unflagging at Dictionary.com
1715, from un- (1) "not" + present participle of flag (v.). Related: Unflaggingly.
unflappable (adj.) Look up unflappable at Dictionary.com
1958, from un- (1) "not" + flap (v.) + -able. Originally used in reference to Harold Macmillan, British P.M. 1957-63.
unflattering (adj.) Look up unflattering at Dictionary.com
1580s, from un- (1) "not" + gerundive of flatter. Related: Unflatteringly.
unfledged (adj.) Look up unfledged at Dictionary.com
c. 1600, of persons, "immature, not experienced," from un- (1) "not" + past participle of fledge (v.). Literal sense of "not yet covered in feathers" is recorded from 1610s.
unflinching (adj.) Look up unflinching at Dictionary.com
1728, from un- (1) "not" + present participle adjective of flinch (v.). Related: Unflinchingly.
unfold (v.) Look up unfold at Dictionary.com
Old English unfealdan, "to open or unwrap the folds of," also figuratively, "to disclose, reveal, explain," from un- (2) "opposite of" + fold (v.). Similar formation in Middle Dutch ontvouden, German entfalten. Intransitive sense is attested from late 14c. Related: Unfolded; unfolding.
unforced (adj.) Look up unforced at Dictionary.com
1590s, from un- (1) "not" + past participle of force (v.).
unforeseeable (adj.) Look up unforeseeable at Dictionary.com
1670s, from un- (1) "not" + foreseeable (see foresee). Related: Unforeseeably.
unforeseen (adj.) Look up unforeseen at Dictionary.com
late 14c., from un- (1) "not" + past participle of foresee. Similar formation in Middle Dutch onvoresien, Dutch onvoorzien, Middle High German unvorsen.
unforgettable (adj.) Look up unforgettable at Dictionary.com
1806, from un- (1) "not" + forgettable. Related: Unforgettably.
unforgivable (adj.) Look up unforgivable at Dictionary.com
1540s, from un- (1) "not" + forgivable. In early use, especially with reference to the sin described in Matt. xii:31. Related: Unforgivably.
unforgiven (adj.) Look up unforgiven at Dictionary.com
early 15c., from un- (1) "not" + past participle adjective from forgive (v.). Old English had unforgifen.
unforgiving (adj.) Look up unforgiving at Dictionary.com
1713, from un- (1) "not" + present participle adjective from forgive. Old English had unforgifende.