זָנָה
From LSJ
λύπης ἰατρός ἐστιν ὁ χρηστὸς φίλος → a true friend is grief's physician, a worthy friend is a physician to your pain
English (Strong)
a primitive root (highly-fed and therefore wanton); to commit adultery (usually of the female, and less often of simple fornication, rarely of involuntary ravishment); figuratively, to commit idolatry (the Jewish people being regarded as the spouse of Jehovah): (cause to) commit fornication, X continually, X great, (be an, play the) harlot, (cause to be, play the) whore, (commit, fall to) whoredom, (cause to) go a-whoring, whorish.