IPA: //ʌn.rɪˈfaɪnd//
KK: /ʌnriˈfaɪnd/
Not processed or purified; in a natural state without any improvements or enhancements.
The oil was still unrefined, containing impurities that needed to be removed.
Unrefined → It is formed from "un-" (meaning not) and "refined" (from Latin "refinire", meaning to purify or improve). The word "unrefined" means not purified or improved, indicating a raw or natural state.
Think of 'not' ('un-') being added to 'purified' ('refined') — that's why unrefined means something that is in its natural, raw state.