fattiest
fat-ti-est
adjective
Having the most fat; the superlative form of 'fatty'.
"This cut of pork is the fattiest."
Thesaurus
Synonyms: fat person, butterball, fatso, fatty, roly-poly, greasy, adipose, buttery, oily, superfatted, sebaceous, fat
Antonyms: fat-free, fatless, nonfat, scrag, skin and bones, thin person