Synonyms and related words :
ad lib, disability, disablement, disqualification, extemporaneousness, imbecility, improvisation, inability, inadeptness, inadequacy, inaptitude, inaptness, inattentiveness, incapacitation, incapacity, incompetence, incompetency, indexterity, ineffectiveness, ineffectuality, inefficiency, ineptitude, ineptness, infancy, inferiority, insufficiency, lack of preparation, legal incapacity, maladjustment, maladroitness, mediocrity, minority, nonpreparation, nonpreparedness, pedestrianism, planlessness, rustiness, skill-lessness, thoughtlessness, unaptness, uncleverness, undeftness, undexterousness, undextrousness, unfitness, unfittedness, unintelligence, unpreparedness, unproficiency, unqualification, unqualifiedness, unreadiness, unschooledness, unskillfulness, unsuitability, unsuitableness, unsuitedness, untrainedness, unworkmanlike, vulnerability, wardship