Origin: Latin suffix -ous
Laborious has 2 different meanings across 1 category:
characterized by effort to the point of exhaustion; especially physical effort
"worked their arduous way up the mining valley"
"a grueling campaign"
"hard labor"
"heavy work"
"heavy going"
"spent many laborious hours on the project"
"set a punishing pace"
Requiring much physical effort; toilsome.