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rare
This type of disease is rare and very dangerous.
It is a very rare flower.
In rare cases, it may last a day or two.
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thin
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uncommon
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rzadki, niecodzienny, niespotykany
It is uncommon for people to live over 100 years old.
These cars are uncommon in Poland.
It's uncommon to see such a thing.
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scarce
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rzadki, nieczęsto spotykany (np. egzemplarz książki, monety)
Good teachers are really scarce.
Trees are scarce in the desert.
Coins that are as old as yours are scarce.
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exceptional
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sporadic
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infrequent
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sparse
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rzadki (o włosach), skąpy (o roślinności)
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runny
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wispy
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rzadki, słaby (o włosach)
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rarefied
,
rarified
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antrin
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selcouth