adj.
- Troublesome or oppressive; burdensome. See synonyms at burdensome.
- Law. Entailing obligations that exceed advantages.
[Middle English, from Old French onereus, from Latin onerōsus, from onus, oner-, burden.]
onerously on'er·ous·ly adv.onerousness on'er·ous·ness n.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
