Rogets II: The New Thesaurus, Third Edition. 1995.
effortless
ADJECTIVE:
1. Posing no difficulty: easy, facile, simple, smooth. Informal :snap. Idioms: easy as ABC, easy as falling off a log, easy as one-two-three, easy as pie, like taking candy from a baby, nothing to it. SeeEASY. 2. Marked by facility, especially of expression: easy, flowing, fluent, fluid, graceful, smooth. SeeSTYLE.