1. (a.) Apparently valid, likely; probable; credible; as a plausible explanation\.

2. (a.) Obtaining approbation; specifically pleasing; apparently right; specious; as, a plausible pretext; plausible manners; a plausible delusion.

3. (a.) Using specious arguments or discourse; as, a plausible speaker.

acceptable admissible apparent apparently sound believable casuistic cogent cogitable colorable colored conceivable conceivably possible contingent credible creditable deceitful deceptive disingenuous empty fallacious fiduciary gilded hollow humanly possible illusive imaginable insincere jesuitic just justifiable legitimate likely logical meretricious misleading ostensible overrefined oversubtle philosophistic possible potential presentable probable rational reasonable reliable sane seeming sensible smooth sophistic sophistical sound specious tenable thinkable tinsel trustworthy trusty unexceptionable unimpeachable unquestionable well-argued well-founded well-grounded wholesome worthy of faith