What is the Latin word for half-witted?

The usual Latin words for “half-witted” are stupidus, mēns. The right choice depends on the sense; see the distinctions below.

English → Latin

“half-witted” in Latin

stupidussenseless, stunned, amazed; stupid; dull mēnsmind; intellect, reason; reasoning, judgement

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

half-witted

stupidus: *mentis or rationis haud compos. For the other compounds, Vid: HALF (adjective).

Quick answer

What is the Latin word for half-witted?: The usual Latin words for “half-witted” are stupidus, mēns. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.