unsuitable (adj.)
- aberrant
- abnormal
- abominable
- atrocious
- bad
- chintzy
- criminal
- delinquent
- deviant
- disgraceful
- evil
- exceptionable
- futile
- ignominious
- ill-advised
- ill-chosen
- ill-considered
- ill-sorted
- ill-timed
- illegal
- impolitic
- impossible
- improper
- inadmissible
- inadvisable
- inapplicable
- inapposite
- inappropriate
- inapt
- inauspicious
- incongruous
- inconvenient
- incorrect
- indecent
- indecorous
- indefensible
- indelicate
- inelegant
- inept
- inexpedient
- infamous
- infelicitous
- inoperable
- inoperative
- inopportune
- intolerable
- intrusive
- irrelevant
- late
- maladjusted
- malapropos
- mismatched
- mismated
- misplaced
- nonfunctional
- objectionable
- off-base
- off-color
- offensive
- otiose
- premature
- sacrilegious
- scandalous
- shameful
- shameless
- sinful
- tasteless
- terrible
- unacceptable
- unadapted
- unbecoming
- unbefitting
- undesirable
- undignified
- undue
- unemployable
- unfavorable
- unfit
- unfitting
- unfortunate
- unhappy
- unhelpful
- unlawful
- unlucky
- unprofitable
- unpropitious
- unqualified
- unready
- unrighteous
- unripe
- unseasonable
- unseemly
- unsuited
- untenable
- untimely
- untoward
- unusable
- unwise
- unworkable
- vulgar
- wicked
- wrong
- wrongful
