정말 + adjective/verb: 정말 좋아요; as a question: 정말요?
really, truly; truth (noun)
Example
한국어 공부가 정말 재미있어요.
Studying Korean is really fun.
Word parts
정 right
정 right + native 말 (words) — literally 'right words'.
Good to know
정말요? means 'Really?' — a handy reaction in conversation.
Related words