inaptitude

inaptitude
    n 1: a lack of aptitude [ant: {aptitude}]
    

Inaptitude \In*apt"i*tude\, n. [In- + aptitude: cf. F.
   inaptitude. Cf. {Ineptitude}.]
   Lack of aptitude.
   [1913 Webster]
    

74 Moby Thesaurus words for "inaptitude":
      abnormality, anomaly, futility, impoliticalness, impoliticness,
      impropriety, inability, inadeptness, inadequacy, inadmissibility,
      inadvisability, inapplicability, inappositeness, inappropriateness,
      inaptness, inattentiveness, incapability, incapacity, incompetence,
      incompetency, incongruity, inconvenience, inconveniency,
      indexterity, ineffectiveness, ineffectuality, inefficiency,
      ineptitude, ineptness, inexpedience, inexpediency, infelicity,
      inopportuneness, irrelevance, irrelevancy, maladjustment,
      maladroitness, mediocrity, mesalliance, misalliance, misjoinder,
      misjoining, mismatch, pedestrianism, rustiness, skill-lessness,
      thoughtlessness, unaptness, uncleverness, uncongeniality,
      undeftness, undesirability, undexterousness, undextrousness,
      unfitness, unfittedness, unfittingness, unfortunateness,
      unintelligence, unmeetness, unproficiency, unprofitability,
      unprofitableness, unschooledness, unseasonableness, unseemliness,
      unskillfulness, unsuitability, untimeliness, untrainedness,
      unwiseness, uselessness, worthlessness, wrongness