Comparative form of grouchy: more bad-tempered, irritable, or inclined to complain and grumble.
From grouchy (complaining, cantankerous), derived from grouch (a person who complains) plus the comparative suffix -er.
Oscar the Grouch made 'grouchy' fun! But the word probably comes from the verb 'grouch,' which itself might come from 'grudge' or 'grouch' sounds—words sometimes evolve from how complaints sound.
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