What is a word that means "the outcome resulting from a lack of action"?

Default Option

The default option is what the system -- or life -- does to you, or for you, when you choose not to take an action.

Wikipedia, the Default Effect (Psychology) https://en.wikipedia.org/wiki/Default_effect_(psychology)

Amongst the set of options that agents choose from, the default option is the option the chooser will obtain if she does nothing.

For example, if you have to check a box on a form for your employer to withhold money for an IRA, and you don't check the box, the default option goes into effect, and you don't have a deferred tax savings plan.

Ballistic trajectory

"a ballistic trajectory is a trajectory traced after the propulsive force is terminated and the body is acted upon only by gravity and aerodynamic drag."

All input forces are in; the course and endpoint are easily calculated by physics, unless there is an outside interception.

A baseball term: strikeout looking

"In baseball scorekeeping, a swinging strikeout is recorded as a K, or a K-S. A strikeout looking (where the batter does not swing at a pitch that the umpire then calls strike three) is often scored with a backward K, and sometimes as a K-L, CK, or Kc (the 'c' for 'called' strike)"