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

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.

Alternative form of God knows

(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

Alternative form of God knows

Alternative form of God knows.