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Adjective: effortless  e-fu(r)t-lus
  1. Requiring or apparently requiring no effort
    "the swallows glided in an effortless way through the busy air"
     
  2. Not showing effort or strain
    "a difficult feat performed with effortless mastery";
    - casual

See also: easy, facile, unforced, unstrained

Antonym: effortful

Encyclopedia: Effortless