In a manner that causes or expresses discomfort; in an uneasy or troubled way.
From discomfortable + -ly (adverb-forming suffix from Old English -lice), converting the adjective into an adverb that modifies verbs or other adjectives.
The -ly adverb ending is so automatic to English speakers that we rarely think about it, but adding -ly to almost any adjective creates an adverb — 'sadly,' 'quickly,' 'discomfortably' — which is why English can create infinite new adverbs on the fly.
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