Grievous1. (a.) Causing grief or sorrow; painful; afflictive; hard to bear; offensive; as, a grievous error in judgment.
2. (a.) Characterized by great atrocity; heinous; aggravated; flagitious; as, a grievous sin.
3. (a.) Full of, or expressing, grief; showing great sorrow or affliction; as, a grievous cry.
Thesaurus Entries
abominable, acute, affecting, afflictive, aggrieved, anguished, appalling, arrant, atrocious, awful, base, beastly, beneath contempt, bitter, black, blameworthy, bleak, brutal, burdensome, calamitous, careworn, cataclysmal, cataclysmic, catastrophic, cheerless, comfortless, contemptible, damaging, dangerous, demanding, deplorable, depressing, depressive, despicable, destructive, detestable, dire, disastrous, discomforting, disgusting, dismal, dismaying, distasteful, distressful, distressing, doleful, dolorific, dolorogenic, dolorous, dreadful, dreary, dumb with grief, egregious, enormous, exacting, exigent, fatal, fell, fetid, filthy, flagrant, foul, fulsome, galling, grave, grief-stricken, griefful, grieved, gross, harmful, hateful, heartbreaking, heartrending, heavy, heinous, horrible, horrid, hurtful, in grief, infamous, intolerable, joyless, lamentable, loathsome, lousy, lugubrious, major, monstrous, mournful, moving, nasty, nefarious, noisome, notorious, obnoxious, odious, offensive, oppressive, outrageous, painful, pathetic, piteous, pitiable, pitiful, plaintive, plangent, plunged in grief, poignant, rank, regrettable, reprehensible, repulsive, rotten, rueful, ruinous, sad, saddening, scandalous, schlock, scurvy, serious, severe, shabby, shameful, sharp, shocking, shoddy, sordid, sore, sorrowed, sorrowful, sorrowing, squalid, superincumbent, taxing, tearful, terrible, too bad, touching, tough, tragic, ugly, unbearable, unclean, uncomfortable, unfortunate, unpalatable, vile, villainous, weighty, woebegone, woeful, worst, worthless, wounding, wreckful, wretched