Easily
来自Big Physics
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Middle English (also in the sense ‘comfortable, tranquil’): from Old French aisie, past participle of aisier ‘put at ease, facilitate’ (see ease).
wiktionary
From Middle English esiliche, equivalent to easy + -ly.
etymonline
easily (adv.)
c. 1300, aisieliche, "in comfortable circumstances; with little effort," from easy + -ly (2). From late 14c. as "gently."