Effortlessly means easily, and with no apparent strain. Moved effortlessly, effortlessly stylish, effortlessly won.
The apparent is doing the work, since anything done effortlessly usually took years to make look that way. It is the highest compliment in sport and in writing alike.
1adverbeffortlesslyEasily, and with no apparent strain.
“The skater glided effortlessly across the ice.”
effortlessly is a manner.
From effortless + -ly.
Etymology from Wiktionary, CC BY-SA