Witless is a related term of imbecilic.
As adjectives the difference between witless and imbecilic
is that witless is destitute of wit or understanding; wanting thought; hence, indiscreet; not under the guidance of judgment while imbecilic is like or as an imbecile; so senseless as to be laughable; absurd, foolish, stupid, idiotic.
witless
Adjective
(
en adjective)
Destitute of wit or understanding; wanting thought; hence, indiscreet; not under the guidance of judgment.
Usage notes
* This term is frequently found in phrases such as (term), (term), and so on.
imbecilic
English
Adjective
(
en adjective)
like or as an imbecile; so senseless as to be laughable; absurd, foolish, stupid, idiotic.