effortless
1. [ adjective ] requiring or apparently requiring no effort
Examples:

"the swallows glided in an effortless way through the busy air"

Related terms: effortful easy unforced easy
2. [ adjective ] not showing effort or strain
Synonyms: casual
Examples:

"a difficult feat performed with casual mastery" "careless grace"

Related terms: easy
Similar spelling:   effortlessly
  effortfulness
  effortful