adverb, adverb taking the 'to' particle, noun or participle which takes 'suru'
trembling from fear; shaking all over
Onomatopoeic word describing a person trembling or shaking, typically from fear, cold, or strong emotion. Often used with と and verbs like 震える.
彼女は恐怖でわなわなと震えていた。
She was trembling all over with fear.
寒
My body is shaking from the cold.