Definition of obnoxious adjective from the Oxford Advanced Learner's Dictionary

 

obnoxious

 adjective
adjective
BrE BrE//əbˈnɒkʃəs//
 
; NAmE NAmE//əbˈnɑːkʃəs//
 
 
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extremely unpleasant, especially in a way that offends people synonym offensive obnoxious behaviour a thoroughly obnoxious little man obnoxious odours Word Origin late 16th cent. (in the sense ‘vulnerable to harm’): from Latin obnoxiosus, from obnoxius ‘exposed to harm’, from ob- ‘towards’ + noxa ‘harm’. The current sense, influenced by noxious, dates from the late 17th cent.Extra examples He was a thoroughly obnoxious little man. I couldn’t stand him. I find her really obnoxious. I tried to ignore her obnoxious behaviour. What an obnoxious little man. the emission of obnoxious odours
See the Oxford Advanced American Dictionary entry: obnoxious