a·stray 
(ə-strā)
(ə-strā)adv.
1. Away from the correct path or direction: an improperly addressed letter that went astray.
2. Away from the right or good, as in thought or behavior; straying to or into wrong or evil ways.
[Middle English, from Old French estraie, past participle of estraier, to stray; see STRAY.]
a·stray adj.