人知れぬ

ひとしれぬ

secret, hidden, unseen, inward

底知れぬ

そこしれぬ

bottomless

未知数(⇔既知数)

みちすー(⇔きちすー)

unkonwn quantity

やも知れぬ

やもしれぬ

may, might, perhaps, may be, possibly

言い知れぬ

いいしれぬ

indescribable, inexpressible

数知れない

かずしれない

countless, innumerable

既知数

きちすう

konwn quantity

未知数

みちすう

unknown quantity

知らぬ存ぜぬ

しらぬぞんぜぬ

complete ignorance (usu. in reference to feigning); lack of knowledge

知らぬ顔

しらぬかお

pretending not to know, feigning ignorance

誰知らぬ

だれしらぬ

nobody knows

見知らぬ

みしらぬ

strange, unfamiliar, unknown

素知らぬ

そしらぬ

feigned, pretending

知能指数

ちのうしすう

intelligence quotient, IQ

素知らぬ顔

そしらぬかお

pretending not to recognize (recognise), feigned ignorance

知らぬが仏

しらぬがほとけ

Ignorance is bliss

知らぬ間に

before one knows it; before one realises; without one's knowledge; without noticing

見も知らぬ

みもしらぬ

completely unknown (usu. of people); unfamiliar; complete (stranger)

知れる

しれる

to become known, to come to light, to be discovered