Openly

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Old English openlīce (see open, -ly2).

wiktionary

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open +‎  -ly

etymonline

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openly (adv.)

"in an open manner, without secrecy," Old English openlice "manifestly, plainly, clearly, unreservedly;" see open (adj.) + -ly (2). It corresponds to Old Saxon opanlico, Old Frisian epplik, Dutch openlijk, Old High German offanliho, German öffentlich.