Origin and history of drafty

c. 1500, a spelling variant of draught (q.v.) to reflect change in pronunciation. By the end of the 19c. it was the established form in the military, commercial, and many technical sentences, and it is now almost universal in American English as conforming to the pronunciation.

The meaning "rough copy of a writing" (something "drawn") is attested from 14c.; that of "preliminary sketch from which a final copy is made" is from 1520s; that of "flow of a current of air" is from c. 1770. Of beer from the 1830s, in reference to the method of "drawing" it from the cask. Sense in bank draft is from 1745. The meaning "a drawing off a group for special duty" is from 1703, in U.S. especially of military service; the verb in this sense first recorded 1714. Related: Drafted; drafting.

very common adjective suffix, "full of, covered with, or characterized by" the thing expressed by the noun, Middle English -i, from Old English -ig, from Proto-Germanic *-iga-, from PIE -(i)ko-, adjectival suffix, cognate with elements in Greek -ikos, Latin -icus (see -ic). Germanic cognates include Dutch, Danish, German -ig, Gothic -egs.

It was used from 13c. with verbs (drowsy, clingy), and by 15c. with other adjectives (crispy). Chiefly with monosyllables; with more than two the effect tends to become comedic.

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Variant forms in -y for short, common adjectives (vasty, hugy) helped poets after the loss of grammatically empty but metrically useful -e in late Middle English. Verse-writers adapted to -y forms, often artfully, as in Sackville's "The wide waste places, and the hugy plain." (and the huge plain would have been a metrical balk).

After Coleridge's criticism of it as archaic artifice, poets gave up stilly (Moore probably was last to make it work, with "Oft in the Stilly Night"), paly (which Keats and Coleridge himself had used) and the rest.

Jespersen ("Modern English Grammar," 1954) also lists bleaky (Dryden), bluey, greeny, and other color words, lanky, plumpy, stouty, and the slang rummy. Vasty survives, he writes, only in imitation of Shakespeare; cooly and moisty (Chaucer, hence Spenser) he regards as fully obsolete. But in a few cases he notes (haughty, dusky) they seem to have supplanted shorter forms.