(idiomatic, dialect, slang) Indicates agreement, approval, encouragement.

It is only known to God; it is unknown to people. / (often modifying a parenthetic concession) It is known unto God; it is certainly true.

(informal, idiomatic) Despite the addressee's belief that the speaker was unaware of something, the speaker, in fact, was already aware.

(idiomatic, vulgar, followed by a wh-clause) I don't know; nobody knows; it is unclear.

(Ireland, dated) God knows; nobody knows / (Ireland, dated) God knows; of course, certainly, nobody could doubt

Alternative form of God knows

Third-person singular simple present indicative form of know someone

(uncommon, chiefly paganism) Synonym of God knows

Third-person singular simple present indicative form of know better

plural of need-to-know