fluently

calmly comfortably conveniently efficiently effortlessly freely handily quickly readily regularly simply smoothly surely well

competently coolly dexterously evenly facilely hand over fist hands down just like that lightly like nothing no sweat nothing to it piece of cake plainly steadily swimmingly uncomplicatedly with ease with no effort without a hitch without trouble

difficultly insufficiently

doubtedly dubitably questionably

constantly smoothly steadily uniformly

horizontally levelly on an even keel placidly regularly straight tranquilly unvaryingly without bumps

inequitably irregularly roughly unevenly unfairly unjustly

evenly

placidly sleekly