like a duck takes to water
comfortably
one-handed
in a walk
with one hand tied behind one's back
at a canter
unimpulsive
ungainfully
natural
effortlessly
unwincingly
painless
unconditioned
spitelessly
easily
panglessly
brinkless
readily
unshakenly
nonintensively
effortless
temptationless
unshaken
inexhaustedly
unforced
unconditionally
unsickly
windlessly
instantaneously
unresistedly
sedately
undefrayed
unweariedly
unhinderedly
unpushy
nondeviating
unarduous
one step at a time
unstumblingly
unpained
unconstrainted
undreamingly
undeflected
forceless
limitlessly
undisorderly
au naturel
undifficult
unhesitantly
unimpassive