weak-mindedEnglishOxford American Thesaurusweak-minded adjective he is just a weak-minded fool: irresolute, weak-willed, weak, impressionable, spineless, indecisive, unassertive, persuadable, persuasible, submissive, compliant, pusillanimous; foolish, simple, feebleminded, witless, mindless, brainless, stupid, idiotic. ▷antonyms strong-willed; intelligent.