compos mentis

having full use of one's mind and control over one's actions went to court to prove that her grandmother was no longer compos mentis and needed a legal guardian Synonyms balanced, clearheaded, sane, lucid, normal, right, stableRelated Words analytic (or analytical), clear, coherent, logical, rational, reasonable; even-keeled, judicious, levelheaded, sensible, wise; healthy, sound, unneurotic; well-adjusted, well-balancedNear Antonyms 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 also meshugah or meshuggah), 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; foolish, senseless, witless; irrational, mixed-up, unreasonable; depressed, despondent; distracted, distraught, frantic, frenzied, haywire, hysterical (also hysteric), raving, wigged-out; amok (or amuck), ape, ballistic, berserk, nuclear; fixated, monomaniac, monomaniacal, obsessedAntonyms brainsick, crazed, crazy, demented, deranged, insane, lunatic, mad, maniacal (also maniac), mental, unbalanced, unsound