unconvincing Synonyms

improbable flimsy unlikely unbelievable unsatisfactory phony weak unsubstantial ridiculous slight unconceivable thin tenuous strained cock-and-bull hard to swallow highly unlikely full of holes unweighty unreproducible unpersuasive unconvincingly lamer unimaginable unrealistic unthinkable questionable preposterous hollow groundless forced feeble fantastic fanciful false fake dubious doubtful implausible inadequate inconceivable poor pathetic lame invalid insufficient insubstantial ineffectual ineffective incredible