sui generis
/suˑ.i ˈɡɛnɛɹɪs/
noun
Meaning
(incorrectly) A thing apart, an isolated specimen
adjective
Meaning
In a class of its own; one of a kind.
(rarer) By itself; of its own.
"It is nothing to worry about sui generis, but in context of the other factors it's alarming indeed."
Synonyms