Synonyms and related words :
admissible, authoritative, balanced, binding, cogent, coherent, commonsense, consistent, cool, coolheaded, credible, deductive, good, inductive, inferential, intelligent, judicious, just, justifiable, lawful, legal, legitimate, levelheaded, philosophical, plausible, practical, pragmatic, proper, rational, reasonable, sane, self-consistent, sensible, sober, sober-minded, sound, substantial, sufficient, syllogistical, valid, weighty, well-argued, well-balanced, well-founded, well-grounded, well-reasoned, well-thought-out, wholesome, wise