What is the antonym for undertaking?

There isn't a single perfect antonym for "undertaking" because its meaning is dependent on context. Here are some possible antonyms depending on the intended meaning:

If "undertaking" refers to a project or task:

* Abandoning

* Neglecting

* Ignoring

* Refusing

* Postponing

* Delaying

If "undertaking" refers to a promise or commitment:

* Breaching

* Violating

* Reneging

* Backing out

If "undertaking" refers to a business or enterprise:

* Liquidation

* Closure

* Dissolution

If "undertaking" refers to a risky or dangerous act:

* Avoiding

* Eschewing

* Declining

To find the most appropriate antonym, you need to consider the specific context in which "undertaking" is used.