IPA: /ˌʌnəˈmjuːzɪŋ/
KK: /ʌnəˈmjuzɪŋ/
Not entertaining or funny; lacking the ability to make someone laugh or enjoy themselves.
The movie was so unamusing that I fell asleep halfway through.
Unamusing → It is formed from "un-" (meaning not) and "amusing" (from Latin "mūsum", meaning to entertain or cause laughter). The word "unamusing" means not entertaining or not causing laughter.
Think of 'not' ('un-') making something 'entertaining' ('amusing') — that's why unamusing means it doesn't entertain.