way·ward 
(wāwərd)
(wāwərd)adj.
1. Deviating from what is desired, expected, or required, especially in being disobedient or in gratifying one's own inclinations: "a teacher taking pains with a wayward but promising child" (George Orwell).
2. Difficult or impossible to manage, control, or keep in order: a wayward strand of hair.
3. Going somewhere not intended or desired: a wayward golf shot; a wayward courier.
4. Following no clear pattern; unpredictable: "events that were often thought to be wayward, capricious, and inexplicable" (Marq de Villiers).
[Middle English, short for awaiward, turned away, perverse : awai, away; see AWAY + -ward, -ward.]
wayward·ly adv.
wayward·ness n.