[half-wit, hahf-] /ˈhælfˌwɪt, ˈhɑf-/
a person who is feeble-minded.
a person who is foolish or senseless; dunderhead.
1670s, originally “a would-be wit whose abilities are mediocre;” sense of “simpleton” (one lacking all his wits) is first attested 1755.
Half-wits are fleas; so little and so light,
We scarce could know they live, but that they bite.
[Dryden, “All for Love”]
Phrase out of half wit “half out of one’s mind” was in Middle English (late 14c.). Half-witted “lacking common sense” is from 1640s.
A foolish person: half-wits in the phys ed class (1755+)
[haf-wit-id, hahf-] /ˈhæfˈwɪt ɪd, ˈhɑf-/ adjective 1. . 2. foolish; stupid.
[haf-lee-ter, hahf-] /ˈhæfˈli tər, ˈhɑf-/ noun 1. a unit of capacity equal to 500 cubic centimeters.
[haf-lahyn, hahf-] /ˈhæfˌlaɪn, ˈhɑf-/ noun, Mathematics. 1. 1 (def 7b).