uncontainable
un con tain a ble |ˌənkənˈtānəbəl ˌənkənˈteɪnəbəl | ▶adjective (esp. of an emotion ) very strong: his uncontainable enthusiasm.
un |con ¦tain |able |ʌnkənˈteɪnəb (ə )l | ▶adjective (especially of an emotion ) very strong: his uncontainable enthusiasm.