What is the opposite word for fulfillment?

There isn't a single perfect opposite for "fulfillment" as the word can have different meanings depending on the context. Here are some options depending on what you're looking for:

If "fulfillment" means a sense of satisfaction or contentment:

* Discontent

* Dissatisfaction

* Emptiness

* Unfulfillment

* Frustration

* Boredom

* Despair

If "fulfillment" means achieving goals or reaching one's potential:

* Failure

* Unsuccess

* Stagnation

* Frustration

* Lack of purpose

If "fulfillment" refers to the completion of a task or obligation:

* Incomplete

* Unfulfilled

* Pending

* Outstanding

The best opposite will depend on the specific context and meaning you want to convey.