hit-or-miss

adjective
🔊/ˌhɪt ɔː ˈmɪs/
🔊/ˌhɪt ɔːr ˈmɪs/
(also hit-and-miss)
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  1. not done in a careful or planned way and therefore not likely to be successful粗制滥造的;时好时坏的Topics Difficulty and failurec2