WordNet sense 1 (not capable of being applied):

inapplicable

WordNet sense 2 (having no bearing on or connection with the subject at issue):

irrelevant

WordNet sense 3 (having undesirable or negative qualities):

bad

WordNet sense 4 (not worthy of being chosen (especially as a spouse)):

undesirable

WordNet sense 5 (not appropriate for a purpose or occasion):

improper, wrong

WordNet sense 6 (not suitable for a particular occasion etc):

inappropriate