More comfortable; comparative form of comfy, meaning more pleasant and easy to be in or use.
From 'comfy,' informal shortening of 'comfortable,' which derives from Old French 'confortable' (strengthening) and Latin 'confortare' (to strengthen). The -ier suffix makes the comparative degree.
English speakers invented 'comfy' in the 1800s as slang, and it became so beloved that we use it constantly in speech, yet it's still considered informal—showing how casual speech sometimes never gets 'permission' to be formal, even after 150+ years.
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