底知れぬ

そこしれぬ

bottomless

数知れぬ

countless; innumerable

人知れず

ひとしれず

secret, hidden, unseen, inward

知人

ちじん

friend, acquaintance

人知

じんち

human intellect, knowledge

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

知る人

しるひと

acquaintance; friend

知識人

ちしきじん

intellectual

知り人

しりびと

acquaintance

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

知る人ぞ知る

しるひとぞしる

well-known only to those in the know, be well-known but to the few, highly regarded by a select few

人文知識

じんぶんちしき

specialist in humanities (Japanese visa category)

人見知り

ひとみしり

shyness, fear of strangers, stranger anxiety

人工知能

じんこうちのう

artificial intelligence (ai)