grumpiest

he was the grumpiest customer i'd ever served, complaining about everything.

my grandpa is notoriously the grumpiest person in the neighborhood.

despite his grumpiest demeanor, he had a heart of gold.

the grumpiest cat in the litter hissed at everyone.

she's usually cheerful, but she was the grumpiest this morning.

he's known for being the grumpiest critic of the new play.

the grumpiest old man sat on the park bench, scowling.

after a long day, he was the grumpiest version of himself.

the grumpiest reviewer gave the restaurant a terrible rating.

even his friends admitted he was the grumpiest during the holidays.

the grumpiest employee refused to help with the project.