1. Synonyms for Bitterly include sorely, agonisingly, agonizingly, dolefully, dolorously, grievously, hard, hardly, inconsolably and lugubriously

2. Abominably acerbically Acerbly acidly acridly acrimoniously agonizingly awfully baldly balefully bitingly blatantly brashly caustically confoundedly corrodingly corrosively cruelly cuttingly damnably deadly deathly deucedly distressingly dolorously dreadfully egregiously excessively excruciatingly exorbitantly extravagantly flagrantly frightfully