adjective. ['ˌtɛmprəˈmɛntəl, ˌtɛmpɝˈmɛntəl'] likely to perform unpredictably; sometimes it would start and sometimes it wouldn't".
adjective. ['ˌtɛmprəˈmɛntəl, ˌtɛmpɝˈmɛntəl'] subject to sharply varying moods.