plausible
Concise Oxford English Dictionary © 2008 Oxford University Press:
plausible/ˈplɔːzəbl/
▶adjective apparently reasonable or probable, without necessarily being so.
– derivatives
plausibility noun,
plausibly adverb.
plausibility noun,
plausibly adverb.
– origin C16 (also in the sense ‘deserving applause’): from L. plausibilis, from plaus-, plaudere ‘applaud’.
'plausible' also found in these Oxford entries:

