Lack of ability (especially mental ability) to do something.

Roget 158: impotence; inability, disability; disablement, impuissance, imbecility; incapacity, incapability; inaptitude, ineptitude, incompetence, unproductivity^†; indocility^†; invalidity, disqualification; inefficiency, wastefulness.    telum imbelle [Lat.], brutum fulmen [Lat.], blank, blank cartridge, flash in the pan, vox et proeterea nihil [Lat.], dead letter, bit of waste paper, dummy; paper tiger; Quaker gun.    inefficacy etc. (inutility) 645^†; failure etc. 732.    helplessness etc. adj.; prostration, paralysis, palsy, apoplexy, syncope, sideration^†, deliquium [Lat.], collapse, exhaustion, softening of the brain, inanition; emasculation, orchiotomy [Med.], orchotomy [Med.].    cripple, old woman, muff, powder puff, creampuff, pussycat, wimp, mollycoddle; eunuch.    ... show more

Roget 699: unskillfulness etc. adj.; want of skill etc. 698; incompetence, incompentency^†; inability, infelicity, indexterity^†, inexperience; disqualification, unproficiency^†; quackery.    folly, stupidity etc. 499; indiscretion etc. (rashness) 863; thoughtlessness etc. (inattention) 458 (neglect) 460; sabotage.    mismanagement, misconduct; impolicy^†; maladministration; misrule, misgovernment, misapplication, misdirection, misfeasance; petticoat government.    absence of rule, rule of thumb; bungling etc. v.; failure etc. 732; screw loose: too many cooks.    blunder etc. (mistake) 495; etourderie gaucherie [Fr.], act of folly, balourdise^†; botch, botchery^†; bad job, sad work.    sprat sent out to catch a whale, much ado about nothing, wild-goose chase.    bungler etc. 701; fool etc. 501.    ... show more

Dutch: insolvabiliteit, onvermogen
Polish: nieumiejętność, nieudolność

Lacking the power to perform.

synonym: unfitness.

Dutch: insolvabiliteit, onvermogen
Polish: niemożliwość, niezdolność, niemożebność, niemożność