More inclined to growl or more bad-tempered and grouchy than something else.
Comparative form of 'growly' (adjective meaning inclined to growl), which comes from the verb 'growl.' The '-er' suffix is used to compare two things, coming from Old English.
This word shows how English uses simple sound patterns—'growl' actually sounds like the behavior it describes, so 'growlier' makes intuitive sense: something deeper and more irritable.
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