inaptitude (n.)
- abnormality
- anomaly
- futility
- impropriety
- inability
- inadequacy
- inadmissibility
- inadvisability
- inapplicability
- inappositeness
- inappropriateness
- inaptness
- inattentiveness
- incapability
- incapacity
- incompetence
- incompetency
- incongruity
- inconvenience
- ineffectiveness
- ineffectuality
- inefficiency
- ineptitude
- ineptness
- inexpedience
- inexpediency
- infelicity
- inopportuneness
- irrelevance
- irrelevancy
- maladjustment
- maladroitness
- mediocrity
- mesalliance
- misalliance
- mismatch
- rustiness
- thoughtlessness
- uncongeniality
- undesirability
- unfitness
- unprofitability
- unprofitableness
- unseasonableness
- unseemliness
- unskillfulness
- unsuitability
- untimeliness
- unwiseness
- uselessness
- worthlessness
- wrongness
