The Vocalibrate dictionary

petulant

US/ˈpɛtʃələnt/GB/ˈpetjʊlənt/adjective

sulky and bad-tempered, like a spoiled child

When he lost the game, he gave a petulant shrug and refused to shake hands.

Near in meaning: sulkypeevishquerulousfractious
In the family: petulance

More words worth knowing

disingenuousinsincere, often by pretending to be innocent or open tacitunderstood without being openly stated asinineextremely foolish or silly fallowplowed but left without crops for a season so the soil can recover speciousseemingly right or true but actually false internecinedestructive to both sides within a group