endeavour

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

• “he had doubts about the whole enterprise”

earnest and conscientious activity intended to do or accomplish something

• “made an effort to cover all the reading material”
• “wished him luck in his endeavor”
• “she gave it a good try”

attempt by employing effort

• “we endeavor to make our customers happy”