unsuitable /ˌʌnˈsuːtəbəl/ adjective Learner's definition of UNSUITABLE
[more unsuitable; most unsuitable]
: not having the qualities that are right, needed, or appropriate for something : not suitable不适当的;不适宜的;不合适的 — unsuitability
/ˌʌnˌsuːtəˈbɪləti/ noun [noncount] — unsuitably
/ˌʌnˈsuːtəbli/ adverb