onerous
Pronunciation: /ˈōnərəs, ˈänərəs
adjective
1(of a task, duty, or responsibility) involving an amount of effort and difficulty that is oppressively burdensome: he found his duties increasingly onerous
1.1 Law involving heavy obligations: an onerous lease
Origin
late Middle English: from Old French onereus, from Latin onerosus, from onus, oner- 'burden'.
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For the two of us it was an onerous task, but we did it. With the pressure on us, None of us wanted to see the project fail.
