Direct Opposites:
* Failure: This is the most straightforward opposite, indicating a lack of success in achieving a goal.
* Incompletion: This refers to not finishing or reaching a goal, even if progress was made.
Other Opposites, Depending on Context:
* Neglect: This implies a lack of effort or attention towards achieving a goal.
* Stagnation: This refers to a lack of progress or development, often due to inaction.
* Destruction: This is the opposite of building something up, and could refer to the undoing of an accomplishment.
* Regression: This implies a return to a previous state, undoing progress made towards a goal.
More Abstract Opposites:
* Dissatisfaction: This refers to a feeling of unfulfillment, even if a goal is technically achieved.
* Meaninglessness: This implies that the accomplishment lacks significance or purpose.
The best opposite for "accomplishment" will depend on the specific context and the intended meaning.