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onerous

on·er·ous

onerous

 
 
pronunciation:
a n rs [or] o n rs
part of speech: adjective
definition: unwanted, unpleasant, and burdensome.
Having to notify families of the death of loved ones was one of the onerous duties of his job.
synonyms:
burdensome, oppressive, taxing, weighty
antonyms:
easy, effortless
similar words:
arduous, cumbersome, demanding, heavy, irksome, laborious, painful, trying, unpleasant, unwanted, wearisome
derivations: onerously (adv.), onerousness (n.)