unable
I
adjective
defenseless, disabled, feckless, forceless, helpless, impotent, inadequate, incapable, incompetent, ineffective, inefficient, inept, inoperative, insufficient, lame, notable, powerless, unfit, unqualified, useless, worthless
II
index
disabled (deprived of legal right), helpless (powerless), inadept, inadequate, incapable, incompetent, inept (incompetent), otiose, powerless, unfit, unqualified (not competent)
Burton's Legal Thesaurus.
William C. Burton.
2006