Synonyms and Antonyms of compos mentis
- went to court to prove that her grandmother was no longer compos mentis and needed a legal guardian
balmy, bananas, batty, bughouse [slang], certifiable, crackbrained, cracked, crackpot, cranky [dialect], cuckoo, daffy, daft, dotty, fruity [slang], gaga, loco [slang], loony (also looney), loopy, meshuga (or meshugge), moonstruck, nuts, nutty, scatty [chiefly British], screwy, wacko (also whacko), wacky (also whacky)
aberrant, delirious, disordered
delusional, delusionary, disturbed, neurotic, obsessive-compulsive, paranoiac (also paranoic), paranoid (also paranoidal), psycho, psychotic, schizo, schizoid, schizophrenic, schizy (or schizzy)
eccentric, odd, oddball, off, pixilated (also pixillated), potty [chiefly British], queer, strange
irrational, mixed-up, unreasonable
distracted, distraught, frantic, frenzied, haywire, hysterical (also hysteric), raving, wigged-out