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知れない

can't understand, can't fathom, unknown, unidentified

→ 知れる
verb · informal Rare #42,000
can't understand, can't fathom Often used in the expression 気が知れない, meaning that someone's thoughts or actions are incomprehensible.
JA: そんなことをするなんて、気が知れない。
EN: I can't understand why anyone would do that.
unknown, unidentified Often follows 正体 or 素性 to describe someone or something whose identity or background is unknown.
JA: 相手は正体の知れない人だった。
EN: The person I was dealing with was someone whose identity was unknown.
Conjugation of 知れる
Potential
知れない

まったく気が知れないよ。

I just don't understand you at all.

— ソング・オブ・ザ・シー 海のうた (2014)

気が知れないね

I just don't understand you.

— TAXi (1998)

素性の知れない誰か過去も国もないけどそれがいい

Someone of unknown origins, with no past and no country—but that’s what makes it good.

— ベルリン・天使の詩 (1987)

正体の知れない敵からデイヴィッドを一日守ったあと、キースは喜んで足を伸ばした。

After protecting David from an unknown enemy all day, Keith happily stretched his legs.