potent, strong, virile

ineffectual, toothless, powerless, useless, emasculated, ineffective, helpless, inept, feckless, enfeebled, feeble, spineless, flaccid, subservient, incapable, rudderless, hopeless, clueless, incompetent, irrelevant, insensate, indifferent, witless, apathetic, pathetic, constipated, indecisive, immobile, pitiful, intransigent, disunited, worthless, futile, incommunicative, unconfident, disinterested, irresolute, omnipotent, ignorant, demoralized, hapless, inefficacious, pointless, lifeless, debilitated, acquiescent, insipid, pusillanimous, purposeless, submissive, unreformable, assailable, incontinent, servile, brainless, meaningless, unaccountable, unworthy, passionless, substanceless, otiose, invincible, incoherent, befuddled, incomprehensible, gutless, mortal, listless, unrecognizable, docile, insensible, vincible, abject, puny, uninvolved, profligate, dysfunctional, obdurate, supine, pitiable, impervious, wimpish, addlepated, ungovernable, obstinate, untrustworthy, unimaginative, spiritless, irresponsive, meek, invulnerable, unconvincing, sexless, inconsequential, risible, humorless, effectual, disorganized, superfluous, uninterested, timorous, anemic, com, cease, depart, hostile, con, predominate, pro, serving, supreme, barren, contrary, derive, ex, partake, pre, short, believe, free, hostage, ibid, jealous, insane, implacable, revengeful, vengeful, baffled, humiliated, infirm, speechless, wrathful, demented, frustrated, unavailing

ineffective, ineffectual, unable, weak