Etymology
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Words related to stupid

steep (adj.)

"having a sharp slope," Old English steap "high, lofty; deep; prominent, projecting," from Proto-Germanic *staupa- (source also of Old Frisian stap "high, lofty," Middle High German *stouf), from PIE *steup-, extended form of root *(s)teu- (1) "to push, stick, knock, beat," with derivations referring to projecting objects (source also of Greek typtein "to strike," typos "a blow, mold, die;" Sanskrit tup- "harm," tundate "pushes, stabs;" Gothic stautan "push;" Old Norse stuttr "short"). The sense of "precipitous" is from c. 1200. The slang sense "at a high price" is a U.S. coinage first attested 1856. Related: Steeply; steepness. The noun meaning "steep place" is from 1550s.

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dull (adj.)

c. 1200, "stupid, slow of understanding, not quick in perception;" also, of points or edges, "blunt, not sharp;" apparently from Old English dol "dull-witted, foolish," or an unrecorded parallel word, or from Middle Low German dul "foolish, reckless," both from Proto-Germanic *dulaz (source also of Old Frisian dol "reckless," Middle Dutch dol, dul "stupid, foolish, crazy," Old Saxon dol, Old High German tol "foolish, dull," German toll "mad, wild," Gothic dwals "foolish").

This sometimes is conjectured to be from PIE *dhul-, from root *dheu- (1) "dust, vapor, smoke," which also produced words for "defective perception or wits, turbidity of the mind" (compare Greek tholos "mud dirt," Old Irish dall "blind").

Dull. Ineffective for the purpose aimed at, wanting in life. A dull edge is one that will not cut ; a dull understanding, does not readily apprehend ; a dull day is wanting in light, the element which constitutes its life ; dull of sight or of hearing is ineffective in respect of those faculties. [Wedgwood]

From late 12c. as a surname. Rare before mid-14c. Of color "not bright or clear," from early 15c.; of pain or other sensations, "not sharp or intense," from 1725. Sense of "not pleasing or enlivening, uninteresting, tedious" is from c. 1400. Related: Dullness.

dull. (8) Not exhilarating; not delightful; as to make dictionaries is dull work. [Johnson]
dizzy (adj.)

Middle English dusie, from Old English dysig "foolish, stupid" (obsolete in the original sense except in dialect from 13c.), from Proto-Germanic *dusijaz (source also of Low German düsig "dizzy," Dutch duizelen "to be dizzy," Old High German dusig "foolish," German Tor "fool," Old English dwæs, Dutch dwaas "foolish"), perhaps from PIE *dheu- (1) "dust, vapor, smoke; to rise in a cloud" (and related notions of "defective perception or wits"). Old English used related dyslic to gloss Latin absurdum, which also seems to imply some defect of the senses (see absurd).

The meaning "having a whirling sensation" is from c. 1400; that of "giddy, thoughtless, heedless," is from c. 1500 and seems to merge the two earlier meanings. Used of the "foolish virgins" in early translations of Matthew xxv; used especially of blondes since 1870s. Related: Dizzily.

stupor (n.)
late 14c., from Latin stupor "insensibility, numbness, dullness," from stupere "be stunned" (see stupid).
masturbation (n.)
Origin and meaning of masturbation

"deliberate erotic self-stimulation," 1711 (earlier as mastupration, 1620s), from French masturbation and directly from Modern Latin masturbationem (nominative masturbatio), noun of action from past-participle stem of Latin masturbari "to masturbate."

The long-standing speculation is that this Latin word is altered (probably by influence of turbare "to disturb, confuse") from *manstuprare, from manu, ablative of manus "hand" (see manual) + stuprare "defile" (oneself), from stuprum "defilement, dishonor," related to stupere "to be stunned, stupefied" (see stupid). Hence the earliest form of the word in English. But perhaps the first element represents an unattested *mazdo- "penis" [OED]. An earlier technical word for this was onanism. Related: Masturbational.

Farmer and Henley ["Slang and Its Analogues," 1898] lists among the slang terms for "to masturbate" or "masturbation" frig (which they trace to Latin fricare "to rub") to bob; to box the Jesuit; to chuff, to chuffer; to claw; to digitate (of women); to fight one's turkey (Texan); to handle; to indorse; to milk; to mount a corporal and four; to dash one's doodle; and they note that it was "sometimes known as KEEPING DOWN THE CENSUS."

rape (v.)

late 14c., rapen, "seize prey; abduct, take and carry off by force," from rape (n.) and from Anglo-French raper (Old French rapir) "to seize, abduct," a legal term, probably from Latin rapere "seize, carry off by force, abduct" (see rapid). Also figuring in alliterative or rhyming phrases, such as rape and renne (late 14c.) "seize and plunder."

The older senses of the English word became obsolete. The surviving meaning "to abduct (a woman), ravish;" also "seduce (a man)" is clearly by early 15c. in English, but it might have been at least part of the sense in earlier uses.

Meaning "to rob, strip, plunder" (a place) is from 1721, a partial revival of the old sense. Uncertain connection to Low German and Dutch rapen in the same sense. In Middle English, and occasionally after, the verb was used in figurative senses of Latin rapere, such as "transport in ecstasy, carry off to heaven," usually in past-participle rapte, which tends to blend with rapt. Related: Raped; raping.

Classical Latin rapere was used for "sexually violate," but only rarely; the usual Latin word being stuprare "to defile, ravish, violate," which is related to stuprum (n.) "illicit sexual intercourse," literally "disgrace," stupere "to be stunned, stupefied" (see stupid). Latin raptus, past participle of rapere, used as a noun meant "a seizure, plundering, abduction," but in Medieval Latin also "forcible violation." 

stupe (n.)
"stupid person," 1762, shortening of stupid.
stupefy (v.)
early 15c., from Latin stupefacere "make stupid or senseless, benumb, stun," from stupere "be stunned" (see stupid) + facere "to make, to do" (from PIE root *dhe- "to set, put").
stupendous (adj.)
1660s, correction of earlier stupendious "causing astonishment, astounding" (1540s), from Late Latin stupendus "to be wondered at," gerundive of Latin stupere "be stunned, be struck senseless, be aghast, astounded, or amazed" (see stupid). Related: Stupendously; stupendousness.
stupidity (n.)
1540s, "want of intelligence," from Latin stupiditatem (nominative stupiditas) "dullness, stupidity, senselessness," from stupidus "confounded, amazed; dull, foolish" (see stupid). It also at various times meant "lack of feeling or emotion" (1560s); "stupor, numbness" (c. 1600).