unsound Synonyms

unfit fallacious unstable bad unfirm unadvised tottery tottering tenuous poor unfounded unreasonable unreasoned unreliable unsubstantial untrue spurious specious questionable ramshackle rattletrap reasonless rickety risky rotten shaky sick sickened sickish sickly sophistic sophistical untruthful unwell valetudinarian unverified chancy damaged unsupported ill-founded untenable wide of the mark unproven unsafe wobbly uncorroborated unreproducible unscientific unproved misguided