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Definition of grievous : 1. Causing grief or sorrow; painful; afflictive; hard to bear; offensive; harmful.
2. Characterized by great atrocity; heinous; aggravated; flagitious; as, a grievous sin.
3. Full of, or expressing, grief; showing great sorrow or affliction; as, a grievous cry.

Synonyms:

rough, heartbreaking, backbreaking, parlous, solemn, large, frightful, cogent, laboured, sober, obese, flagitious, heartrending, fleshy, unsafe, sorrowful, afflicting, risky, dire, corpulent, heinous, deplorable, intemperate, desperate, pathetic, clayey, happy, horrible, searing, inhuman, stark, regrettable, wicked, venturesome, harsh, spartan, horrifying, enceinte, disturbing, unplayful, dense, rigorous, unhealthy, telling, important, rotund, awful, critical, punishing, big, doleful, weighty, with child, heavy, ugly, terrible, rugged, lamentable, sullen, laborious, tough, dangerous, labored, stiff, unspeakable, sad, good, hazardous, distressing, lowering, sedate, disquieting, evil, upsetting, leaden, ponderous, grim, outrageous, of import, great, toilsome, gravid, hardhanded, torturous, murderous, monstrous, grave, villainous, rueful, brutal, onerous, overweight, galling, extreme, wakeless, weighed down, help, knockout, operose, life-threatening, expectant, grotesque, cloggy, atrocious, austere, dreadful, lumbering, abominable, jeopardizing, gruelling, serious, menacing, mournful, threatening, sound, profound, impenetrable, flagrant, sonorous, dismal, dolorous, stern

disastrous, detrimental, unfriendly, unfavorable, tragic, antipathetic, inauspicious, adverse, difficult, hard, unpropitious, perilous, opposing, calamitous, untoward, unfortunate, unlucky, catastrophic

disagreeable, troublesome, insufferable, sore, hurtful, anguishing, crushing, harrowing, burdensome, uncomfortable, stinging, annoying, bitter, bothersome, trying, odious, piercing, chafing, grueling, horrendous, irksome, withering, biting, painful, severe, distressful, torturing, smarting, tormenting, cruel, aching, arduous, stabbing, miserable, unbearable, sharp, throbbing, gnawing, unpleasant, cramping, besetting, aggravating, excruciating, inflaming, irritating, oppressive, offensive, wrenching, agonizing, cutting, woeful, acute

Usage examples:

• But what I said was far less grievous to a man of honest mind than little Ruth's own behaviour. - "Lorna Doone, A Romance of Exmoor", R. D. Blackmore.
• But in this speech there is a touch of personal pathos in the passage in which he said that, for himself, it would be a grievous day when he had to leave his native Turin with its straight, formal streets, for Rome and its splendid monuments, for which he was not artist enough to care. - "Cavour", Countess Evelyn Martinengo-Cesaresco.
• This truly is a grievous accusation. - "The Life and Genius of Nathaniel Hawthorne", Frank Preston Stearns.