Here are some synonyms for "hastened":
* Accelerated
* Speeded up
* Rushed
* Expedited
* Promoted
Here are some examples of how "hastened" can be used in a sentence:
* The doctor's arrival hastened the patient's recovery.
* The storm hastened the end of the picnic.
* The new technology hastened the development of the product.
Note: "Hastened" can also be used as an adjective, meaning "done quickly or suddenly."