Valid
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loony, untruthful, false, mistaken, implausible, unreal, untenable, bad, inconceivable, unscientific, counterfeit, erroneous, invalid, unconvincing, unconfirmed, specious, impotent, questionable, misguided, Daffy, unjustified, unvindicable, Eristic, impossible, preposterous, uncompelling, thoughtless, weak, indefensible, uninformed, unpersuasive, ineffective, sporadic, Unreasoned, improbable, indefinite, misleading, unimaginable, wrong, Falsified, unacceptable, unjustifiable, infrequent, inaccurate, unlikely, dubious, fake, senseless, doubtful, uncommitted, unauthorized, ungenuine, incredible, unarticulated, casuistic, flimsy, groundless, undecided, unsound, unbelievable.