Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
jerkily is an adverb meaning "with spasms". It carries 2 recorded senses.
with spasms
“the mouth was slightly open, and jerked violently and spasmodically at one corner”
with jerking motions
“She rose stiffly, jerkily from the window seat”
Definitions, synonyms and semantic relations for jerkily come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.