In a comfortable manner; in a way that provides ease, relaxation, and freedom from worry.
From 'comfy' (informal shortening of comfortable) + '-ly' adverb suffix. Maintains the casual tone of 'comfy' while making it describe how an action is performed.
Languages love turning adjectives into adverbs with '-ly,' but 'comfily' is interesting because it lets informal, friendly 'comfy' become an adverb—so you can write 'she settled comfily in her chair' and sound both relaxed and grammatical at once.
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