adverb
An adverb modifies a verb, adjective, or another adverb. It often answers the questions how, when, where, or to what extent. In this case, 'cringingly' is an adverb describing how something is done in a cringing manner.
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Her cringingly awkward behavior at the meeting was noticed by everyone in the room.
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I can't believe he wore that cringingly ugly shirt to the party.
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The TikTok video was so cringingly bad, it went viral for all the wrong reasons.
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The tension in the room was cringingly palpable as they waited for the results to be announced.