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1.
I. an action that is generally pointless and will have no effect.

II. A discussion that is useless in the bigger picture and in which neither party is actually right, even thought both sides of the argument try to win every time.
I. washing your car before a thunderstorm is an exercise in futility
Ia. trying to exterminate cockroaches

II. the unending fight over whether rock is better than rap.
by Herzlos March 19, 2008
 
2.
When parts of your body are still jiggling long after you have stopped running.
Jennifer was the only one in the gym who considered her workout to be an exercise in futility, since the men all appreciated that her boobs were still bouncing long after she got off the treadmill.
by leroywaggle June 14, 2011