1
Stage 1 of 4
onus
Latin · ancient
"burden, load"
burden, load
2
Stage 2 of 4
onerosus
Latin · ancient
"burdensome"
burdensome, from onus
3
Stage 3 of 4
onereus
Old French · medieval
"heavy or difficult to bear"
carried into French for something heavy or difficult to bear
4
Stage 4 of 4
onerous
English · 1300s
"involving great effort or difficulty, burdensome"
settled as the English word for something involving great effort or difficulty
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