querulous

habitually complaining

Given to quarreling; quarrelsome.

Latin 'querulus' meaning complaining

“In a fit of unjustified doubt of her sincerity, he complained, with a querulous snap: 'You have your own ideas; you have your own ideas.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

Tunde the querulous chef flung open the doors of his Nairobi restaurant, yelling at an imaginary sous-chef. "Why is this stew bland? The tomatoes aren't even ripe!" His constant complaining drove away customers, leaving only the stray cats feasting on the delicious, yet neglected food.

In the narrow cobblestone streets of Coyoacán, Tariq weaved through the crowd, but every few steps he would pause, his face scrunching up as he complained about everything from the heat to the noise. At a street vendor's cart piled high with tamales, his querulous voice reached a new pitch, harping on the price until even the patient seller suggested he look elsewhere.

“They are joined by Toad, who persuades Mole and Rat to join him on a holiday in his new horse-drawn caravan, pulled by the querulous horse Alfred.”