easily (adv.)

c. 1300, aisieliche, "in comfortable circumstances; with little effort," from easy + -ly (2). From late 14c. as "gently."

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Definitions of easily from WordNet

easily (adv.)
with ease (`easy' is sometimes used informally for `easily');
he won easily
was easily confused
she was easily excited
this china breaks very easily
Synonyms: easy
easily (adv.)
without question;
easily the best book she's written
easily (adv.)
indicating high probability; in all likelihood;
a mistake that could easily have ended in disaster
Synonyms: well