c. 1300, aisieliche, "in comfortable circumstances; with little effort," from easy + -ly (2). From late 14c. as "gently."
he won easily
was easily confused
she was easily excited
this china breaks very easily
easily the best book she's written
a mistake that could easily have ended in disaster
ear-worm
ease
easeful
easel
easement
easily
east
Easter
Easter Island
easterling
easterly