"jerkily" in the adverb sense
1. spasmodically, jerkily
"the mouth was slightly open, and jerked violently and spasmodically at one corner"
with jerking motions
"She rose stiffly, jerkily from the window seat"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License