arduous Hear it!

arduous definition

ar·du·ous (är′jo̵̅o̅ əs)

adjective

  1. difficult to do; laborious; onerous
  2. using much energy; strenuous
  3. steep; hard to climb

Etymology: L arduus, steep < IE *er(ə)dh-, high, to grow (> L arbor, tree) < base *er-, to set in motion, run

Related Forms:

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

Comments
Improve this definition.
Do you have more to add? Share your linguistic knowledge or observation.
/Register to save your comments.