1
Stage 1 of 3
exfortiare
Vulgar Latin · ancient
"to show strength"
'ex-' plus 'fortis', strong
2
Stage 2 of 3
esforz
Old French · medieval
"exertion"
a show of strength
3
Stage 3 of 3
effort
English · 1480s
"exertion"
'effortless' dates from the 1700s
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