Reading your question, I take it you seek an adjective that describes an action which is preformed with little
force behind it. Something not considering how efficient the action actually is, but rather how little thought it requires or how easily look it looks. If you gave a little more context, perhaps I could assist you better... Never the less, here's something in a vein of which—at the time of my writing this—others have not proposed.
deftly grabbed an glass of champagne off of a waiter's tray as he bustled by. "
Here the word
deftly describes how some guy grabbed a drink, in a fragile glass, off the tray of somebody rushing past him without spilling it or knocking all the drinks over. No easy task. Doing so would require an extreme amount of coordination and perfect timing.
When I imagine such an interaction, I don't picture some guy in a suit who is hunched over, arm outstretched, eyeing the approaching waiter like some athlete awaiting the ball. That's how I would look if attempting to grab this hypothetical champagne. (I'm terribly uncoordinated.) What I imagine is a suave gentleman who—appears to—effortlessly preform such an astounding feat without paying much attention, showing concern, of visibly displaying a large amount of effort.
Some similar words: