Learner's definition of UGLY
[also more ugly; most ugly]
1 a : unpleasant to look at : not pretty or attractive b : unpleasant to hear 2 : offensive or disgusting
an ugly racial slur
3 : very bad or unpleasant
They avoided what could have been an ugly situation.
Things could get/turn ugly. [=nasty]
He has an ugly disposition/temper.