unattestable
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unprovable — Synonyms and related words: agnostic, ambiguous, capricious, chancy, changeable, controvertible, dicey, doubting, equivocal, erratic, fickle, hesitant, hesitating, incalculable, indecisive, indemonstrable, irresolute, polysemous, skeptical, touch … Moby Thesaurus
unsupportable — Synonyms and related words: baseless, controvertible, empty, groundless, idle, ill founded, insupportable, intolerable, unattestable, unbased, unbearable, unconfirmable, undemonstrable, undemonstratable, unendurable, unfounded, ungrounded,… … Moby Thesaurus
unsustainable — Synonyms and related words: baseless, controvertible, empty, groundless, idle, ill founded, unattestable, unbased, unconfirmable, undemonstrable, undemonstratable, unfounded, ungrounded, unprovable, unsubstantiatable, unsupportable, unsupported,… … Moby Thesaurus