Deliberately

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late Middle English (as an adjective): from Latin deliberatus, ‘considered carefully’, past participle of deliberare, from de- ‘down’ + librare ‘weigh’ (from libra ‘scales’).

wiktionary

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deliberate +‎  -ly

etymonline

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deliberately (adv.)

late 15c., "with due consideration, with a set purpose," from deliberate (adj.) + -ly (2).