1. (a.) Being in a healthy condition; not deranged; acting rationally; -- said of the mind.

2. (a.) Mentally sound; possessing a rational mind; having the mental faculties in such condition as to be able to anticipate and judge of the effect of one's actions in an ordinary manner; -- said of persons.

admissible all there balanced bright bunkum clearheaded clearminded cogent commonsense compelling compos mentis conceptive conceptual convincing cool coolheaded credible discursive down-to-earth earthy fit good hale hardheaded healthy-minded ideational intellectual intelligent judicious just justifiable knowing legitimate level-headed levelheaded logical lucid matter-of-fact mentally sound noetic normal not so dumb of sound mind oriented philosophical plausible positivistic practical practical-minded pragmatic prudent rational realist realistic reasonable right right-minded sage sane-minded sapient scientific scientistic secular sensible sober sober-minded sophic sound sound-minded sound-thinking straight-thinking strong-minded together understanding unideal unidealistic unromantic unsentimental well well-argued well-balanced well-founded well-grounded wholesome wise worldly