In a disguised manner; in a way that conceals true identity, appearance, or nature; under a false guise.
From disguised (past participle of disguise) + -ly (adverb suffix). The -ly converts the adjective into an adverb describing how an action is performed.
When Shakespeare wrote of people acting 'disguisedly,' he was describing emotional deception—not just wearing costumes but performing false feelings, which is often harder to detect than physical disguise.
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