IPA: /ˌʌnəˈfɛktɪŋ/
KK: /ʌnəˈfɛktɪŋ/
Not causing any strong feelings or emotions.
The movie was so unaffecting that I almost fell asleep.
Unaffecting → It is formed from "un-" (meaning not) and "affecting" (from Latin "affectare", meaning to influence or have an effect on). The word "unaffecting" means not having an influence or effect, often used to describe something that is emotionally neutral or uninspiring.
Think of 'not' ('un-') influencing or having an effect ('affecting') — that's why unaffecting means something that does not influence or inspire.