Really is an adverb used to intensify adjectives or verbs (e.g., really good, really fast) and to express genuine surprise or concern. It can also function as a discourse marker in conversation. Pronounced with a light initial schwa, it often reduces to /ˈriːli/ in careful speech, while in rapid speech it commonly becomes /ˈrɪli/ or /ˈriːli/ with vowel reduction. Primary stress sits on the first syllable.
Full pronunciation guide