List of regrettable synonyms and regrettable related words.
abominable, affecting, afflictive, arrant, atrocious, awful, base, beastly, beneath contempt, bitter, blameworthy, bleak, brutal, calamitous, cheerless, comfortless, contemptible, deplorable, depressing, depressive, despicable, detestable, dire, discomforting, disgusting, dismal, dismaying, distressful, distressing, dolorific, dolorogenic, dolorous, dreadful, dreary, egregious, enormous, execrable, fetid, filthy, flagrant, foul, fulsome, grievous, gross, hateful, heartbreaking, heinous, horrible, horrid, infamous, joyless, lamentable, loathsome, lousy, monstrous, mournful, moving, nasty, nefarious, noisome, notorious, obnoxious, odious, offensive, outrageous, painful, pathetic, piteous, pitiable, pitiful, poignant, rank, reprehensible, repulsive, rotten, rough, rueful, sad, saddening, scandalous, schlock, scurvy, shabby, shameful, shaming, sharp, shocking, shoddy, sordid, sore, sorrowful, squalid, terrible, too bad, touching, tough, unclean, uncomfortable, unfortunate, unhappy, unlucky, upsetting, vile, villainous, woebegone, woeful, worst, worthless, wretched, wrong