preposterous Antonyms

in possession of all one's faculties sage sagacious reasonable reasoned rationalistic rational prudent politic plausible persuader perceptive logical justified just judicious intelligent sane sapient highly desirable sapiens enlightened commonsensical wise valid thoughtful thinkable syllogistic sound sophistical solemn smart shrewd serious sensible inferential inferable conjecturable conceivable colorable cogitable clever circumspect brilliant bright brainy believable attractive astute appealing