Word parts sulk + -y Pronunciation IPA (key): /ˈsʌlki/ Audio (UK)(file) Hyphenation: sul‧ky Adjective Positive sulky Comparative sulkier Superlative sulkiest A sulky person is silent or bad-tempered after being upset. Synonyms: sullen and morose Noun Singular sulky Plural sulkies (countable) A sulky is a two-wheeled cart that is often used in horse racing. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads