Etymology
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approachable (adj.)
1570s, "accessible," from approach (v.) + -able. Figurative sense, "affable, friendly," is from 1610s. Related: Approachably; approachability.
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unapproachable (adj.)
1580s, of places, from un- (1) "not" + approachable. Of persons, "distant, aloof," attested from 1848. Related: Unapproachably.
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affable (adj.)

of persons, "open to conversation or approach," late 15c., from Old French affable "benign, approachable" (14c.), from Latin affabilis "approachable, courteous, kind, friendly," literally "who can be (easily) spoken to," from affari "to speak to," from ad "to" (see ad-) + fari "to speak" (from PIE root *bha- (2) "to speak, tell, say"). Related: Affably.

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inaccessible (adj.)

"not to be reached or approached," early 15c., from Old French inaccessible (14c.), from Late Latin inaccessibilis "unapproachable," from in- "not" (see in- (1)) + accessibilis "approachable" (see accessible). Related: Inaccessibly; inaccessibility. Earlier in same sense was unaccessible (c. 1400).

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dysprosium (n.)

element, obtained 1906 from an earth discovered in 1886, the last to be extracted from the complex earth called yttria, and named dysprosia in reference to the difficulty of obtaining it, from Greek dysprositos "hard to get at, difficult of access," from dys- "bad, difficult" (see dys-) + prositos "approachable." With metallic element suffix -ium.

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