unpersuasive Synonyms

not convincing lame insufficient ineffectual ineffective incredible inconclusive inconceivable inadequate improbable obscure poor thin unweighty unconvincing unimpressive unbelievable unsatisfactory flimsiest weak vain unsuccessful implausible hollow fruitless disputable derisory delicate deficient defective convincer convincing conclusive compelling dissuasive doubtful empty frivolous fragile forceless flimsy flabby feeble faulty faint failing ambiguous