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Discover LudwigThe phrase "are uncommon" is correct and usable in written English.
It can be used to describe something that is not frequently encountered or is rare in a particular context.
Example: "These species of plants are uncommon in this region, making them a unique find for botanists."
Alternatives: "are rare" or "are infrequent".
Dictionary
are uncommon
adjective
Rare; not readily found; unusual.
synonyms
Exact(59)
Recurrences are uncommon.
Taxis Tips are uncommon.
Still, live performances are uncommon.
Attacks in Khyber are uncommon.
The more serious reactions are uncommon.
Nursing homes are uncommon in the Philippines.
Allegations of assault against them are uncommon.
By contrast, bleeding disorders are uncommon.
But such large medical staffs are uncommon.
Overdoses at school are uncommon but not unheard of.
But assaults like the one on Saturday are uncommon.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com