Synonyms of obnoxious

obnoxious (adjective) :
{UK /əbˈnɒk.ʃəs / } { US / əbˈnɑːk.ʃəs / }

•very unpleasant.
•extremely unpleasant.

Synonyms: 

abhorrent, abominable,odious,repulsive, unpleasant, nasty, unpalatable, unsavour, disgusting, repulsive, dreadful, awful, terrible, offensive, disagreeable, off-putting, frightful, revolting, foul, repellent, vile, repugnant, loathsome, hateful, sickening, nauseating, detestable, nauseous, insufferable, abominable, execrable, beyond the pale, anacceptable, intolerable, despicable, contemptible, loathly, noisome, disgustful, base,ghastly ,hideous, scabrous, bogging, godawful, beastly, poisonous, obscene, noxious, yucky, gross, horrid, putrid, gruesome, horrible, sick-making,

antonyms: 

Charming, delightful, pleasant,