In a dishonest manner; by means of deception, fraud, or lack of integrity.
From 'dishonest' (dis- + honest) with the adverbial suffix '-ly' (from Old English '-lice'). The adverb form emerged to modify verbs and describe actions performed without honesty.
The suffix '-ly' transforms adjectives into adverbs, but notice how adding '-ly' makes dishonesty sound more deliberate and intentional—'dishonest' describes a person, but 'dishonestly' describes a calculated action.
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