untenable
I
adjective
accessible, baseless, controvertible, defenseless, erroneous, exposed, fallacious, false, faulty, groundless, hollow, illogical, implausible, incapable of being defended, incapable of being held, incapable of being maintained, incorrect, indefensible, insupportable, invalid, irrational, powerless, pregnable, questionable, refutable, ridiculous, specious, undefended, undemonstrable, unfortified, unguarded, unjustifiable, unmaintainable, unprotected, unreasonable, unsound, unsustainable, unwarrantable, vincible, vulnerable, weak, wrong
II
index
baseless, disabled (deprived of legal right), doubtful, helpless (defenseless), ill-founded, illogical, implausible, inadequate, indefensible, insubstantial, invalid, ludicrous, nonsubstantial (not sturdy), sophistic, unbelievable, unfounded, unreasonable, unsound (fallacious), unsupported, unsustainable, vulnerable
Burton's Legal Thesaurus.
William C. Burton.
2006