/ ʌnˈsuːtəbl; NAmE ; BrE also -ˈsjuː-/ adjective
unsuitable (for sb/sth) not right or appropriate for a particular person, purpose or occasion :
He was wearing shoes that were totally unsuitable for climbing.
OPP suitable
► un·suit·abil·ity noun [ U ]
► un·suit·ably adverb :
They were unsuitably dressed for the occasion.