Synonyms of faithfully

2 Syllables
staunchly, truly
3 Syllables
exactly, compliantly, reliably
4 Syllables
confirmedly, carefully, devotedly, rigorously, unerringly, regularly, religiously, unchangingly, conscientiously, obediently, literally, circumspectly, dependably, providently
5 Syllables
indisputably, undisputably, undeviatingly