effortlessly
adv.in a way that looks very easy. You use this when someone does something well without needing to try hard.
adv.in a manner requiring no apparent exertion or struggle. Often describes the performance of a skill or the completion of a task.
“She swims effortlessly across the pool.”
“The experienced pianist played the difficult piece effortlessly, making it look like the simplest song in the world.”
“The athlete glided effortlessly toward the finish line, maintaining a pace that left his competitors visibly exhausted and struggling to keep up.”
Manner adverb — typically follows the verb it modifies or the direct object.
“He shuffles in from a side room, effortlessly cool in his dog-print designer shirt , external , and leads us outside.”
“We’ve seen his arms transform effortlessly into weapons.”
From effortless + -ly.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.