Origin and history of beady

mid-14c., bede, "prayer bead," from Old English gebed "prayer," with intensive or collective prefix *ge- + Proto-Germanic *bidam "entreaty." This reconstructed word is also the source of Middle Dutch bede, Old High German beta, German bitte, Gothic bida "prayer, request," which according to Watkins is from a PIE root *gwhedh- "to ask, pray."

The shift in meaning in English comes via rosary beads threaded on a string to count prayers, and in verbal phrases bid one's beads, count one's beads, etc. The German cognate Bitte is the usual word for the conversational request "please." Compare Spanish cuentas "the beads of a rosary," from contar "to count."

The word is also related to bid (Old English biddan) and Gothic bidjan "to ask, pray." The sense in Modern English was further transferred to other small globular bodies, such as "drop of liquid" (1590s), "small knob forming front sight of a gun" (1831, Kentucky slang); hence draw a bead on "take aim at," 1841, U.S. colloquial.

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.