burdensome Synonyms

onerous taxing troublesome grievous weighty exacting demanding oppressive cumbersome arduous heavy strenuous troublous tricky tough rugged toilsome toilful serious severe tiring thorny sore stodgy superincumbent stressful trying unwieldy uphill encumbrous grueling gruelling heavyweight labor-intensive brain surgery burdensomeness unbearable backbreaking cumbersomeness upstream laboured vexatious wearing wearisome wearying worrisome wrenching back-breaking rough distressful