Synonyms of dreadfully

2 Syllables
badly
3 Syllables
fearfully, horribly, wretchedly, shoddily, frightfully, awfully, terribly, shockingly, dismally
4 Syllables
tragically, staggeringly, drastically, unpleasantly, disturbingly, appallingly
5 Syllables
discouragingly, disgracefully, disreputably, unforgivably, reprehensibly