Etymology
1. 1530, aphetic form of
atwite, from O.E.
ætwitan "to blame, reproach," from
æt "at" +
witan "to blame," from P.Gmc.
*witanan (cf. O.E.
wite, O.S.
witi, O.N.
viti "punishment, torture;" O.H.G.
wizzi "punishment,"
wizan "to punish;" Du.
verwijten, O.H.G.
firwizan, Ger.
verweisen "to reproach, reprove," Goth.
fraweitan "to avenge"), from PIE base
*weid- "to see." For sense evolution, cf. L.
animadvertere, lit. "to give heed to, observe," later "to chastise, censure, punish." The noun meaning "foolish, stupid and ineffectual person" is first attested 1934 in British slang, popular 1950s-60s, crossed over to U.S. with British sitcoms. It probably developed from the verb sense of "reproach" but may be influenced by
nitwit.
2. PIE word
3. *h₂éd
4. The verb is an apheretic form of atwite (“(obsolete) to blame, reproach”), from Middle English atwiten (“to attribute (something) to someone; to blame (something) on someone; to accuse or charge (someone) with something; to speak ill of; to taunt”), from Old English ætwītan (“to blame, reproach; to censure, upbraid; to taunt”), from æt- (prefix meaning ‘at, near; toward’) + wītan (“to accuse; to blame, reproach”) (from Proto-Germanic *wītaną (“to punish; to torment; to know; to see”), from Proto-Indo-European *weyd- (“to see”)). Piecewise doublet of advise.
5. The noun is probably derived from the verb, although it is attested in print earlier. See: Proto-Germanic '
*wītaną'.