hideous
Concise Oxford English Dictionary © 2008 Oxford University Press:
hideous/ˈhɪdiəs/
▶adjective extremely ugly.
■ extremely unpleasant.
– derivatives
hideously adverb,
hideousness noun.
hideously adverb,
hideousness noun.
– origin ME: from OFr. hidos, hideus, from hide, hisde ‘fear’.
'hideous' also found in these Oxford entries:

