Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Troublesome or oppressive; burdensome. synonym: burdensome.
  • adjective Law Entailing more liabilities than benefits or imposing significant obligations.

from The Century Dictionary.

  • Burdensome; oppressive.
  • In Scots law, imposing a burden in return for an advantage; being for a consideration: as, an onerous contract: opposed to gratuitous.
  • Synonyms 1. Heavy, weighty, toilsome.

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Burdensome; oppressive.
  • adjective (Scots Law) a good and legal consideration; -- opposed to gratuitous.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective imposing or constituting a physical, mental, or figurative load which can be borne only with effort.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective not easily borne; wearing

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Middle English, from Old French onereus, from Latin onerōsus, from onus, oner-, burden.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin onerosus ("burdensome"), from onus ("load").

Examples

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