1752, "passive, making no effort," from effort + -less. Meaning "easy, requiring no effort" is from 1810. Related: Effortlessly; effortlessness.
the swallows glided in an effortless way through the busy air
effluent
effluvia
effluvium
efflux
effort
effortless
effrontery
effulgence
effulgent
effuse
effusion
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