Antonyms of adj demented

1 sense of demented

Sense 1
brainsick, crazy, demented, disturbed, mad, sick, unbalanced, unhinged -- (affected with madness or insanity; "a man who had gone mad")

INDIRECT (VIA insane) -> sane -- (mentally healthy; free from mental disorder; "appears to be completely sane")

Similarity of adj demented

1 sense of demented

Sense 1
brainsick, crazy, demented, disturbed, mad, sick, unbalanced, unhinged -- (affected with madness or insanity; "a man who had gone mad")
       => insane (vs. sane) -- (afflicted with or characteristic of mental derangement; "was declared insane"; "insane laughter")