Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Old French
Origin: onereus, from Latin onerosus, from onus; ONUS

onerous

 adjective
     
on‧er‧ous formal
work or a responsibility that is onerous is difficult and worrying or makes you tired:
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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