He has a sullen, rebellious spirit; a violent temper; and an untoward, intractable disposition.
There are no more uses of "untoward" in the book.
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For I should say that I know from experience that the bearing of those in extreme circumstances can sometimes be untoward and even shocking, and we must try our best to understand what is actual and essential to a person, and what is by any indication anomalous, a momentary lapse that is better forgotten than considered time and time again, to little avail.
Chang-rae Lee -- A Gesture Life
Thereafter, the whistle alone will deal with trespassing or any other untoward behaviour.