1. rare, uncommon (vs. common)

usage: not widely known; especially valued for its uncommonness; "a rare word"; "rare books"

2. rare, infrequent (vs. frequent)

usage: recurring only at long intervals; "a rare appearance"; "total eclipses are rare events"

3. rare, scarce (vs. abundant)

usage: not widely distributed; "rare herbs"; "rare patches of green in the desert"

4. rare, rarefied, rarified, thin (vs. thick)

usage: having low density; "rare gasses"; "lightheaded from the rarefied mountain air"

5. rare, uncommon, extraordinary (vs. ordinary)

usage: marked 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"

6. rare, raw (vs. cooked)

usage: (of meat) cooked a short time; still red inside; "rare roast beef"

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