人知れぬ

ひとしれぬ

secret, hidden, unseen, inward

知人

ちじん

friend, acquaintance

人知

じんち

human intellect, knowledge

人ずれ

ひとずれ

becoming worldly-wise (through one's interactions with other people); becoming sophisticated; losing one's innocence; losing one's naivety

底知れず

そこしれず

bottomless, very deep

読み人知らず

よみびとしらず よみじんしらず

author unknown, anonymous

詠み人知らず

よみじんしらず

author unknown; anonymous

知らず知らず

しらずしらず

unconsciously, unwittingly, unawares

行方知れず

ゆくえしれず

missing (of a person); lost; unaccounted for; whereabouts unknown

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

知らず

しらず

not having, unaffected by

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

見ず知らず

みずしらず

strange, unfamiliar, unknown, new

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)

露知らず

つゆしらず

utterly ignorant, not knowing, having no idea, (being a) blithering idiot