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Definition of onerous:

  1. Burdensome; oppressive.

Synonyms:

galling, tedious, grueling, causing care, heartbreaking, vexatious, ponderous, weighty, rigorous, tiresome, overpowering, fatiguing, rigorous, distressing, austere, embittering, tiring, overtaxing, plodding, pressing, responsible, exacting, afflictive, irksome, grievous, excessive, serious, heavy, exhausting, burdensome, merciless, taxing, weighty, effortful, exigent, painful, exacting, intolerable, backbreaking, backbreaking, crushing.

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