effortless
These birds can soar almost effortlessly for hours.
She looked effortlessly cool as she left the club on Friday evening.
When the health visitor came, she effortlessly passed her assessment.

SMART Vocabulary: related words and phrases

Easiness and simplicity
(as) easy as pie/ABC/anything/falling off a logidiom
a piece of cakeidiom
accessibility
at the push of a buttonidiom
at the stroke of a penidiom
be a matter of somethingidiom
foolproof
frictionless
frictionlessly
friendly
gift
painlessly
painting
painting by numbersidiom
the path of least resistanceidiom
walkaway
walkover
wieldy
with your eyes closed/shutidiom
within the capacity of someone/something