Sentence:  He felt <WSD>obnoxious</WSD> and knew perfectly well that he would have no explanation whatsoever had anyone discovered him, but she looked so alluring, so untroubled, so fortunate, that his only concern was the terrible crack the shutter made...quiet as it was. 
Meaning of the word marked with <WSD> tags:  Extremely unpleasant or offensive; very annoying, odious or contemptible.