monomania

noun
🔊/ˌmɒnəˈmeɪniə/
🔊/ˌmɑːnəˈmeɪniə/
[uncountable] (psychology心理)
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  1. too much interest in or enthusiasm for just one thing so that it is not healthy单狂,偏狂(非理性的固执)Topics Illnessc2