onerous
ON-er-usadjMeaning heavy and troublesome, like a burden
Memory hook a heavy load ON US. Every box in the move lands on us: Sven staggers along under a tower of them. The job is onerous.
Caring for twelve goats turned out to be an onerous chore.
In context The new rules were so onerous that small shops could barely follow them; each one demanded hours of extra paperwork every week.
Similar burdensome, heavy, taxing, oppressive
Opposite light, easy
From Latin onerosus, from onus (load, burden).