Synonyms of efficiently

2 Syllables
cleanly, soundly, neatly, aptly
3 Syllables
orderly, famously, nicely, expertly, thoroughly, adroitly, easily, skillfully, sweepingly, sprucely, adeptly, handily
4 Syllables
capitally, commendably, proficiently, precisely, assiduously, fastidiously, competently
5 Syllables
irreproachably, accurately, methodically, meticulously