笨重 (bèn zhòng): heavy; cumbersome; unwieldy; laborious; arduous

This old-fashioned TV is big and heavy; one person simply can't move it.

If you carry heavy luggage while hiking, you'll soon be out of breath from exhaustion.

Early mobile phones were very bulky, but today's smartphones are thin and light enough to slip into a pocket.

Although these heavy cotton shoes are warm, they are very inconvenient for running.

On moving day, he carried heavy boxes up and down the stairs alone, sweating profusely.