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say it: OH-nur-uhs
onerous is an adjective meaning "not easily borne; wearing". It carries one recorded sense.
not easily borne; wearing
“the burdensome task of preparing the income tax return”
“my duties weren't onerous; I only had to greet the guests”
“a taxing schedule”
Definitions, synonyms and semantic relations for onerous come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.