שָׁגַג

From LSJ

τί ἥδιστον, τὸ ἐπιτυγχάνειν → what's pleasant, to get the goal

Source

English (Strong)

a primitive root; to stray, i.e. (figuratively) sin (with more or less apology): X also for that, deceived, err, go astray, sin ignorantly.