In a manner that involves or suggests cheating or deception; dishonestly or fraudulently.
From 'cheat' (Middle English) + '-ing' (present participle suffix) + '-ly' (adverb suffix). This two-suffix construction turns the verb 'cheat' into an adverbial form indicating manner or method.
The double-suffix '-ingly' creates a sound that feels inherently sneaky—the sliding of 'ing' into 'ly' almost mimics someone slipping away. It's why 'cheatingly' sounds more devious than 'dishonestly,' even though they mean roughly the same thing.
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