Synonyms of decidedly

1 Syllable

right, real, oft, sure

2 Syllables

highly, downright, clearly, strongly, bloody, really

3 Syllables

surely, hugely, mightily, powerful, signally, audibly, overtly, patently, harmfully, strikingly, grievously, frightfully, terribly, solidly, distinctly, markedly, robustly, sturdily, healthily, devoutly, vibrantly, horribly

4 Syllables

distressingly, surpassingly, infallibly, conspicuously, manifestly, noticeably, sonorously, transparently, menacingly, perilously, precariously, drastically, regrettably, vigorously, staggeringly, surprisingly, unfailingly, unshakably, explicitly, outstandingly, invincibly, deplorably, threateningly, securely, disturbingly

5 Syllables

unambiguously, emphatically, unquestionably, positively, unmistakably, decisively, penetratingly, recognizably, unimpeachably, definitely, determinedly, discouragingly, indispensably, terrifically, particularly, irrefutably, absolutely, astonishingly

6 Syllables

unequivocally, categorically, exaggeratedly