Open English Wordnet
Adjectives
(s)rarenot widely known; especially valued for its uncommonness“a rare word”,
“rare books” (s)rarerecurring only at long intervals“a rare appearance”,
“total eclipses are rare events” (s)rarenot widely distributed“rare herbs”,
“rare patches of green in the desert” (s)rare, rarefied, rarifiedhaving low density“rare gasses”,
“lightheaded from the rarefied mountain air” (s)rare, uncommonmarked by an uncommon quality; especially superlative or extreme of its kind“what is so rare as a day in June” (J.R.Lowell),
“a rare skill”,
“an uncommon sense of humor”,
“she was kind to an uncommon degree” (s)rare(of meat) cooked a short time; still red inside“rare roast beef”