Plausible
Part of speech: adjective
Definition: Seemingly or apparently valid, likely, or acceptable; credible: a plausible excuse. Worthy of being applauded; praiseworthy; commendable; ready. Obtaining approbation; specifically pleasing; apparently right; specious; as, a plausible pretext; plausible manners; a plausible delusion. Using specious arguments or discourse; as, a plausible speaker. A possibility in reason or thought experiment, but which may as a matter of fact be true or false, the truth of which is yet unknown to the thinker.
Example sentence: If something were brought about without an antecedent cause, it would be untrue that all things come about through fate. But if it is plausible that all events have an antecedent cause, what ground can be offered for not conceding that all things come about through fate?
Insincere
Part of speech: adjective
Definition: not sincerenot serious
Example sentence: I much prefer a compliment, even if insincere, to sincere criticism.