adj. 25B6; adjective
indefensible cruelty : INEXCUSABLE, unjustifiable, unjustified, unpardonable, unforgivable; uncalled for, unprovoked, gratuitous, unreasonable, unnecessary.
an indefensible system of dual justice : UNTENABLE, unsustainable, insupportable, unwarranted, unwarrantable, unjustifiable, unjustified, flawed, unacceptable.
an indefensible island : DEFENCELESS, vulnerable, exposed, open to attack, pregnable, undefended, unfortified, unguarded, unprotected, unarmed.