rational

admissible analytic analytical analytic/analytical a priori a priori arguable believable clever cleverest coherent commonsensical common-sense compos mentis conscious consequent consistent convincing credible down-to-earth hardheaded hard-nosed/hardheaded intellectual intelligent judicious level-headed liberalistic levelheaded likelier likely logical lucid mental more analytical more analytical more believable more analytic more analytic more consistent more credible more conscious more hardnosed more hard nosed more hard-nosed more hardheaded more hardheaded more intelligent more philosophic more philosophical more philosophical more probable more practical more reasonable more reasonable more regular most analytic most analytic most analytical most analytical most consistent most hard nosed most hard-nosed most hardnosed most hardheaded most hardheaded most logical most philosophical most philosophical most philosophic most sagacious most sensible naturalistic perceptive philosophical/philosophic philosophical practical pragmatical probable psychical ratiocinative realistic reasonable reasonable regular responsible right ruminative sagacious sane sensible sober sound tenable thinking thoughtful true-life unromantic well-balanced wise wiser wisest