In a manner characterized by gnawing; with a persistent, biting quality.
From gnawing (present participle of gnaw) plus -ly adverb suffix. Creates an adverb describing how something happens or is done with a gnawing quality.
Gnawingly describes both physical sensations (a gnawingly cold wind) and emotional ones (a gnawingly persistent doubt)—metaphor is everywhere in how we describe experience!
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