Synonyms of proficiently

2 Syllables
ably, glibly, rightly, fully, smoothly, strongly, soundly, deftly
3 Syllables
correctly, splendidly, famously, nicely, cunningly, properly, closely, expertly, agreeably, thoroughly, profoundly, skillfully, adeptly, suitably
4 Syllables
carefully, favorably, capitally, commendably, excellently, completely, ingeniously, conscientiously, efficiently, dexterously, competently, admirably, successfully
5 Syllables
resourcefully, irreproachably, accurately, attentively, effectively, adequately
6 Syllables
satisfactorily