[adj] not appropriate for a purpose or occasion; "unsuitable attire for the office"; "said all the wrong things"
[adj] not worthy of being chosen (especially as a spouse)
[adj] not meant or adapted for a particular purpose; "a solvent unsuitable for use on wood surfaces"
[adj] not conducive to good moral development; "the movie is unsuitable for children"
[adj] not capable of being applied; "rules inapplicable to day students"