Witless is a related term of simpleminded.
As adjectives the difference between witless and simpleminded
is that witless is destitute of wit or understanding; wanting thought; hence, indiscreet; not under the guidance of judgment while simpleminded is stupid.
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.