Laborious — synonyms, definition

1. laborious (a)

applied arduous assiduous burdensome busy constant detailed devoted difficult diligent distressing disturbing exhausting fatiguing grinding grueling gruelling hard hard-working indefatigable • • •

2. laborious (Adjective)

backbreaking heavy operose punishing

laborious (Adjective) — Characterized by effort to the point of exhaustion; especially physical effort. ex. "spent many laborious hours on the project"