Synonyms of persistently

3 Syllables
studiously, busily, endlessly, frequently, headstrongly, doggedly, stolidly, forever, mulishly
4 Syllables
diligently, unweariedly, consistently, regularly, untiringly, continually, tenaciously, adamantly, vigilantly, bullheadedly, intractably, pigheadedly, resistantly, resolvedly, unyieldingly
5 Syllables
unrelentingly, animatedly, obdurately, perseveringly, interminably, indomitably, obstinately, unwaveringly, pertinaciously, contumaciously
6 Syllables
indefatigably, opinionatedly