In a colorable manner; in a way that appears reasonable or plausible, though possibly deceptive or not entirely truthful.
From 'colorable' + '-ly' (manner adverb). Following English word formation, it transforms the adjective into an adverb describing how something is done.
You might hear this in legal contexts—'the defendant colorably argued...' means the argument sounds plausible but the speaker doubts its truth!
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