preposterous Antonyms

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