chubbiest

/CH AH1 B IY0 AH0 S T/
adjective
  1. 1

    Of a person: slightly overweight, somewhat fat, and hence plump, rounded, and soft.

    โ€œObviously the chubby child was eating too much.โ€

  2. 2

    Of a body part: containing a moderate amount of fat.

    โ€œItโ€™s quite normal for babies to have chubby cheeks.โ€

Source: https://en.wiktionary.org/wiki/chubbiest, https://en.wiktionary.org/wiki/chubby