IPA: /ʌnˈplɛzənt/
KK: /ʌnˈplɛzənt/
Something that is not enjoyable or causes discomfort.
The smell from the garbage was very unpleasant.
Unpleasant → It is formed from "un-" (meaning not) and "pleasant" (from Latin "placere", meaning to please). The word "unpleasant" means not pleasing or causing discomfort.
Think of 'not' ('un-') being added to something that 'pleases' ('placere') — that's why unpleasant means something that does not please.