untenable adj : (of theories etc) incapable of being defended or justified [syn: indefensible]
- Not able to be held, as of an opinion or position; unholdable,
- "The theory of cold fusion was untenable."
Not able to be held, as of an opinion or position
aidless, baseless, defenseless, empty, exceptionable, fatherless, faulty, flawed, friendless, groundless, guideless, helpless, idle, ill-founded, illogical, implausible, impossible, inadmissible, indefensible, inexpiable, insupportable, intolerable, leaderless, motherless, objectionable, pregnable, specious, unacceptable, unbased, undesirable, unforgivable, unfounded, unfriended, ungrounded, unjustifiable, unjustified, unpardonable, unprotected, unreasonable, unsound, unsuitable, unsupportable, unsupported, unsustainable, unsustained, unwarranted, vain, vulnerable, weak, without basis, without foundation