grievous Synonyms

atrocious dangerous heartbreaking heartrending heavy monstrous life-threatening grave weighty severe serious ruinous ruthful saddening rueful shocking punishing ponderous plaintive sad pitiful pitiable painful mournful nasty onerous operose oppressive pailful sad-faced parlous peracute perishing piteous sobering sore sorrowful superincumbent woeful woesome wounding wretched yearnful backbreaking grueling heavyweight nociceptive heart-breaking unbearable heart-rending