adverb, adverb taking the 'to' particle
noisily eating; chewing with mouth open; smacking
Describes the sound or manner of eating noisily, often with the mouth open. Typically used with と.
He eats noisily, smacking his lips.
Describes something like paper or cloth that is wrinkled or crushed. Used as a na-adjective.
The paper got crumpled in my pocket.
Describes a messy or untidy state, often for hair, clothes, or a room. Used as a na-adjective.
My hair is messy, like I just woke up.