It depends on the country or libretto (play or story used). It can be 'opera buffo' (Italian),m 'Opera Comique' (French) or 'Comic Opera' (English). also sometimes called 'Light Opera' in English...
Entertaining
It means funny, not in a laugh-out-loud sense, but in a puts-a-smile-on your face sense. It is also very close in meaning to "entertaining".
amusing - funny, entertaining, humourous
Interesting
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