EXTREMELY Synonyms: 138 Similar and Opposite Words - Merriam-Webster
https://www.merriam-webster.com/thesaurus/extremely
WEBSynonyms for EXTREMELY: very, incredibly, terribly, highly, too, so, badly, damned; Antonyms of EXTREMELY: somewhat, slightly, little, nominally, negligibly, just, hardly, barely.
DA: 86 PA: 77 MOZ Rank: 51