Really is pronounced REE-lee (IPA /ˈriːli/). Curl tongue back for /r/, then forward to roof for /l/.
IPA: /ˈriːli/
Syllables: REE · lee
Common ESL mistake: Learners say 'wree-lee' or 'lee-lee' confusing /r/ and /l/.
Tip: Curl tongue back for /r/, then forward to roof for /l/.