noun

1. earnest and conscientious activity intended to do or accomplish something

e.g. made an effort to cover all the reading material
wished him luck in his endeavor
she gave it a good try

Synonym: attempteffortendeavortry

2. a purposeful or industrious undertaking (especially one that requires effort or boldness)

e.g. he had doubts about the whole enterprise

Synonym: enterpriseendeavor