Part of speech:
Displaying a complete lack of forethought and good sense
The definition of fatuous is foolish or silly.
Showing foolishness or stupidity.
Having or showing little sense, judgment, or sobriety; foolish, stupid, absurd, ludicrous, irrational, etc.
Unwilling to talk; silent
Find another word for brainless. In this page you can discover 34 synonyms, antonyms, idiomatic expressions, and related words for brainless, like: anencephalic, mindless, ability, fatuous, foolish, idiotic, imbecile, silly, stupid, thoughtless and witless.