grumpy
adjective

- easily annoyed and complaining

(Cambridge Advanced Learner's Dictionary)

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WORD ORIGIN

The origin of grumpy is unknown, but may be an extension of the 17th century word "grum" which was used in the same sense. Or it may have evolved from the obsolete phrase "humps and grumps," which referred to complaining remarks.

Conventional wisdom holds that older men can be grumpy. Building on this, a Hampshire pub came up with a brilliant idea. Irritated by the concept of the "Happy Hour," the owners established a "Grumpy Hour." It gives grumpy old men (or young for that matter) the chance to complain about anything from the failure of the global markets to English football. It became so popular that they created an official "Grumpy Club."

sources: BBC News

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SYNONYMS

surly, cantankerous, crabby, cross, crotchety, disgruntled, grouty, irritable, moody, sullen, testy

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Practice OWAD in a conversation:

"Don't expect a smile from him before noon, he's always GRUMPY in the morning."