Synonyms of 'agonizingly'

awfully, baldly, bitterly, brashly, confoundedly, cruelly, deadly, deathly, deucedly, distressfully, dreadfully, excessively, excruciatingly, exorbitantly, extravagantly, flagrantly, grievously, hellishly, improperly, infernally, painfully, sorely, terribly, unduly