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Adjective: onerous  ó-nu-rus or ow-nu-rus
  1. (of a task) requiring hard or challenging work
    "my duties weren't onerous; I only had to greet the guests";
    - burdensome, taxing

See also: heavy

Nearest

one-night stand
one-ninth
one-off
one-on-one
one-party
one-person
one-piece
one-quadrillionth
one-quarter
one-quintillionth
onerous
onerously
onerousness
one-seed
one-seeded
oneself
one-seventh
one-sided
one-sidedly
one-sidedness
onesie