grouchiest

/G R AW1 CH IY0 AH0 S T/
adjective
  1. 1

    (originally student slang) Irritable; easily upset; angry; tending to complain.

    โ€œHis boss gets grouchy when deadlines draw near.โ€

Source: https://en.wiktionary.org/wiki/grouchiest, https://en.wiktionary.org/wiki/grouchy