Synonyms and related words :
Urdummheit, brainlessness, caducity, decrepitude, disability, disablement, disqualification, foolishness, ignorance, imbecility, inability, inadeptness, inadequacy, inaptitude, inaptness, inattentiveness, incapability, incapacitation, incompetence, incompetency, indexterity, ineffectiveness, ineffectuality, inefficacy, inefficiency, ineptitude, ineptness, infancy, inferiority, infirmity, insipidity, instability, insufficiency, invalidism, irrationality, lackbrainedness, lackwittedness, legal incapacity, low IQ, maladjustment, maladroitness, mediocrity, mental weakness, mindlessness, minority, pedestrianism, primal stupidity, reasonlessness, ricketiness, rustiness, senility, senselessness, shakiness, skill-lessness, slackmindedness, slackwittedness, thoughtlessness, unaptness, uncleverness, undeftness, undexterousness, undextrousness, unfirmness, unfitness, unfittedness, unintellectuality, unintelligence, unproficiency, unschooledness, unskillfulness, unsoundness, unsteadiness, unsturdiness, unsubstantiality, untrainedness, unwisdom, unwiseness, vapidity, wardship, wateriness, wishy-washiness, witlessness