arduous, demanding, exhausting, vigorous; see active 2, difficult 1. See syn. study at active.
Marked by vigorous physical exertion:
Possessing, exerting, or displaying energy:
Yes, I'd like to receive Word of the Day emails from YourDictionary.com
By continuing, you agree to our
Please set a username for yourself.
People will see it as Author Name with your public flash cards.