Synonyms of 'curmudgeon'
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a peevish bad-tempered person
A grouch is someone who is always complaining in a bad-tempered way.
He's an old grouch but she puts up with him.
You can describe people as malcontents when you disapprove of the fact that they are dissatisfied with a situation and want it to change.
Five years ago, a band of malcontents seized power.
Thesaurus for curmudgeon from the Collins English Thesaurus
If you call someone a curmudgeon , you do not like them because they are mean or bad-tempered .