Word parts eternal + -ly Pronunciation (UK) IPA (key): /ɪˈtɜː.nə.li/ or /ɪˈtɜːn.li/ (US) (Canada) IPA (key): /ɪˈtɝ.nə.li/ or /iˈtɝ.nə.li/ (UK) (AU) IPA (key): /ɪˈtɜːn.li/ Audio (UK)(file) Adverb Positive eternally Comparative none Superlative none If you are eternally grateful for something that someone has done, you are grateful for it forever. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads