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onerous (adj.)

"burdensome, troublesome," late 14c., from Old French onereus, honereus (14c., Modern French onéreux) and directly from Latin onerosus "burdensome, heavy, oppressive," from onus (genitive oneris) "a burden" (see onus). Related: Onerously; onerousness.

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Definitions of onerous from WordNet

onerous (adj.)
not easily borne; wearing; "my duties weren't onerous; I only had to greet the guests";
Synonyms: burdensome / taxing
From wordnet.princeton.edu