easy (adj.)

c. 1200, "at ease, having ease, free from bodily discomfort and anxiety," from Old French aisie "comfortable, at ease, rich, well-off" (Modern French aisé), past participle of aisier "to put at ease," from aise (see ease (n.)). Sense of "not difficult, requiring no great labor or effort" is from late 13c.; of conditions, "offering comfort, pleasant," early 14c. Of persons, "lenient, kind, calm, gentle," late 14c. Meaning "readily yielding, not difficult of persuasion" is from 1610s. The concept of "not difficult" was expressed in Old English and early Middle English by eaþe (adv.), ieþe (adj.), apparently common West Germanic (compare German öde "empty, desolate," but of disputed origin.

Easy Street is from 1890. Easy money attested by 1889; to take it easy "relax" is from 1804 (be easy in same sense recorded from 1746); easy does it recorded by 1835. Easy rider (1912) was African-American vernacular for "sexually satisfying lover." The easy listening radio format is from 1961, defined by William Safire (in 1986) as, "the music of the 60's played in the 80's with the style of the 40's." Related: Easier; easiest.

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Definitions of easy from WordNet
easy (adj.)
posing no difficulty; requiring little effort;
took the easy way out of his dilemma
the house is easy to heat
an easy victory
satisfied with easy answers
an easy job
an easy problem
easy (adj.)
not hurried or forced;
an easy walk around the block
Synonyms: easygoing / leisurely
easy (adj.)
free from worry or anxiety;
an easy good-natured manner
knowing that I had done my best, my mind was easy
easy (adj.)
affording pleasure;
easy good looks
easy (adj.)
having little impact;
an easy pat on the shoulder
Synonyms: gentle / soft
easy (adj.)
readily exploited or tricked;
an easy victim
an easy mark
easy (adj.)
in fortunate circumstances financially; moderately rich;
easy living
Synonyms: comfortable / prosperous / well-fixed / well-heeled / well-off / well-situated / well-to-do
easy (adj.)
marked by moderate steepness;
an easy climb
Synonyms: gentle
easy (adj.)
affording comfort;
soft light that was easy on the eyes
easy (adj.)
casual and unrestrained in sexual behavior;
her easy virtue
easy (adj.)
less in demand and therefore readily obtainable;
commodities are easy this quarter
easy (adj.)
obtained with little effort or sacrifice, often obtained illegally;
easy money
easy (adv.)
with ease (`easy' is sometimes used informally for `easily');
success came too easy
Synonyms: easily
easy (adv.)
without speed (`slow' is sometimes used informally for `slowly');
go easy here--the road is slippery
Synonyms: slowly / slow / tardily
easy (adv.)
in a relaxed manner; or without hardship;
the judge went easy on the young defendant
just wanted to take it easy
Synonyms: soft