adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
Mimetic adverb describing slow, sluggish movement or progress. Often used with と or する.
渋滞で車がのろのろと進んでいる。
The cars are moving slowly due to the traffic jam.
彼はのろのろと立ち上がった。
He stood up sluggishly.