Having the characteristics or qualities of a curmudgeon; grumpy, bad-tempered, or miserly.
From 'curmudgeon' (noun) plus '-ish' (adjective-forming suffix meaning 'having the quality of'), creating an adjective describing curmudgeon-like qualities.
The '-ish' suffix is wonderfully flexible—it can mean 'somewhat' or 'having the quality of,' which is why 'curmudgeonish' is slightly softer than 'curmudgeonly,' implying someone is kind of grumpy rather than thoroughly grumpy.
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