Answer:

lamest

AnswerCrossword Clue
LAMESTLeast believable
LAMESTUnlikeliest to be bought
LAMESTLeast plausible
LAMESTLike the worst excuse
LAMESTLike the worst of excuses
LAMESTLeast convincing
LAMESTMost contrived
LAMESTLeast satisfactory
LAMESTMost halting