na-adjective, noun
unsuitable; unfit; not suited
Used for people, things, or situations that are not well matched to a purpose, role, or condition. Often appears in the pattern 〜に不向きだ or 〜には不向きだ.
この仕事は彼には不向きだ。
This job is not suited for him.
この素材は屋外での使用には不向きです。
This material is unsuitable for outdoor use.