Synonyms for extremely rare

Synonyms for extremely

incredibly (exceedingly, fantastically, exceptionally >>)
highly (particularly, especially, intensely >>)
really (too, so, very much >>)
hugely (immensely, enormously, vitally >>)
terribly
most
greatly
severely (seriously, grossly, badly >>)
exclusively
wildly
exceeding

See all synonyms for extremely

Synonyms for rare

uncommon (unusual, scarce, sparse >>)
occasional
unique
exceptional

See all synonyms for rare