WordNet sense 1 (above average in size or number or quantity or magnitude or extent):

big, large

WordNet sense 2 (shockingly brutal or cruel):

atrocious, flagitious, grievous, heinous

WordNet sense 3 (morally bad or wrong):

evil

WordNet sense 4 (distorted and unnatural in shape or size; abnormal and hideous):

grotesque, unnatural

WordNet sense 5 (displeasing to the senses):

ugly