A lack of cognitive skill.

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.    ... meer laten zien

Roget 645: inutility; uselessness etc. adj.; inefficacy^†, futility; ineptitude, inaptitude; unsubservience^†; inadequacy etc. (insufficiency) 640; inefficiency, etc. (incompetence) 158; unskillfulness etc. 699; disservice; unfruitfulness etc. (unproductiveness).. 169; labor in vain, labor lost, labor of Sisyphus; lost trouble, lost labor; work of Penelope; sleeveless errand, wild goose chase, mere farce.    tautology etc. (repetition) 104; supererogation etc. (redundancy) 641.    vanitas vanitatum [Lat.], vanity, inanity, worthlessness, nugacity^†; triviality etc. (unimportance) 643.    caput mortuum [Lat.], waste paper, dead letter; blunt tool.    litter, rubbish, junk, lumber, odds and ends, cast-off clothes; button top; shoddy; rags, orts^†, trash, refuse, sweepings, scourings, offscourings^†, waste, rubble, debris, detritus; stubble, leavings; broken meat; dregs etc. (dirt) 653; weeds, tares; rubbish heap, dust hole; rudera^†, deads^†.    fruges consumere natus [Lat.] [Horace]. etc. (drone) 683 ... meer laten zien