maladjusted (adj.)
- ill-chosen
- ill-sorted
- ill-timed
- improper
- inadequate
- inadmissible
- inapplicable
- inapposite
- inappropriate
- inapt
- incapable
- incompetent
- ineffective
- ineffectual
- inept
- infelicitous
- irrelevant
- malapropos
- mismatched
- mismated
- misplaced
- unable
- unadapted
- unadjusted
- unbecoming
- unbefitting
- unequipped
- unfit
- unfitting
- unqualified
- unseasonable
- unseemly
- unsuitable
- unsuited
- untimely
