4. (adj)rare, rarefied, rarified having low density Synonyms: uncommon, rarified, noble-minded, elevated, lofty, idealistic, exalted, rare, sublime, high-minded, high-flown, grand, rarefied Antonyms: abundant, ordinary, thick, cooked, frequent, common
5. (adj)rare, uncommon marked by an uncommon quality; especially superlative or extreme of its kind Synonyms: rarefied, rarified, rare, uncommon Antonyms: ordinary, thick, abundant, cooked, frequent, common
6. (adj)rare (of meat) cooked a short time; still red inside Synonyms: rarefied, rarified, uncommon Antonyms: abundant, common, ordinary, frequent, thick, cooked
Synonyms, Thesaurus & Antonyms of 'RARE'
English Synonyms and Antonyms
1. RARE Some of the oldest or most ancient words are not obsolete, as father, mother, etc. A word is obsolete which has quite gone out of reputable use; a word is archaic which is falling out of re Synonyms: obsolete, ancient, archaic, obsolescent, out of date, antiquated, disused, old, rare
Synonyms for RARE 
