of theories etc Incapable of being defended or justified.

synonym: indefensible.

Roget 477: intuitive, instinctive, impulsive; independent of reason, anterior to reason; gratuitous, hazarded; unconnected.    unreasonable, illogical, false, unsound, invalid; unwarranted, not following; inconsequent, inconsequential; inconsistent; absonous^†, absonant^†; unscientific; untenable, inconclusive, incorrect; fallacious, fallible; groundless, unproved; non sequitur [Lat.], it does not follow.    deceptive, sophistical, jesuitical; illusive, illusory; specious, hollow, plausible, ad captandum [Lat.], evasive; irrelevant etc. 10.    weak, feeble, poor, flimsy, loose, vague.    irrational; nonsensical etc. (absurd) 497.    foolish etc. (imbecile) 499; frivolous, pettifogging, quibbling; finespun^†, overrefined^†.    at the end of one's tether, au bout de son latin.    ... show more

Roget 725: surrendering etc. v.; submissive, resigned, crouching; downtrodden; down on one's marrow bones; on one's bended knee; unresistant, unresisting, nonresisting; pliant etc. (soft) 324; undefended.    untenable, indefensible; humble etc. 879.    ... show more

Roget 158: powerless, impotent, unable, incapable, incompetent; inefficient, ineffective; inept; unfit, unfitted; unqualified, disqualified; unendowed; inapt, unapt; crippled, disabled etc. v.; armless^†.    harmless, unarmed, weaponless, defenseless, sine ictu [Lat.], unfortified, indefensible, vincible, pregnable, untenable.    paralytic, paralyzed; palsied, imbecile; nerveless, sinewless^†, marrowless^†, pithless^†, lustless^†; emasculate, disjointed; out of joint, out of gear; unnerved, unhinged; water-logged, on one's beam ends, rudderless; laid on one's back; done up, dead beat, exhausted, shattered, demoralized; graveled etc. (in difficulty) 704; helpless, unfriended^†, fatherless; without a leg to stand on, hors de combat [Fr.], laid on the shelf.    null and void, nugatory, inoperative, good for nothing; ineffectual etc. (failing) 732; inadequate etc. 640; inefficacious etc. (useless) 645.    ... show more