- out of the correct path or direction
- out of the right, good, or expected way; into error
WordReference Random House Learner's Dictionary of American English © 2014
lost:The letter must have gone astray. away into error, confusion, or undesirable action or thought:Wicked companions led her astray.
adj. [be + ~] lost:I was astray and couldn't find my way. confused; in error:was astray in those calculations.