Etymology
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smoothly (adv.)

1520s, "in a smooth manner, blandly," from smooth (adj.) + -ly (2). Meaning "without impediment or complications" is from 1660s.

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Definitions of smoothly

smoothly (adv.)
with no problems or difficulties;
put the plans into effect quickly and smoothly
Synonyms: swimmingly
smoothly (adv.)
in a smooth and diplomatic manner;
`And now,' he said smoothly, `we will continue the conversation'
From wordnet.princeton.edu