Synonyms of ineffectively

2 Syllables
weakly, feebly, poorly, badly
3 Syllables
faultily, ineptly
4 Syllables
deficiently, blunderingly, erroneously, imperfectly, maladroitly, unskillfully
5 Syllables
ineffectually, perfunctorily, abominably
6 Syllables
inefficaciously, inadequately