Where does “laborious” come from?

Laborious comes from Old French laborios, derived from Latin laboriosus, formed from the Latin root labor with the suffix -osus meaning full of or characterized by, ultimately tracing to Proto-Indo-European leb-.

laborious (English): Requiring much physical effort; toilsome;...

Definitions

  1. Requiring much physical effort; toilsome;...

Ancestry of “laborious”, step by step

StepLanguageWordMeaning
1Old Frenchlaborios
2Frenchlaborieuxlaborious
3Latinlaboriosuslaborious, toilsome, demanding; industrious,...
4Latinlāborwork
5Old Latinlabos
6Romanianlabăpalm; paw
7Hungarianlábleg; foot; support, stand
8Proto-Uralicluwebone
9Proto-Iranian*Hrawpācáhfox
10Proto-Indo-Iranian*Hrawpāćásfox

Words derived from “laborious

Every word from Proto-Indo-Iranian *Hrawpāćás