adverb, noun or participle which takes 'suru', adverb taking the 'to' particle
aimlessly; idly; in a messy way
Describes doing something without clear purpose, or being in a disordered, sloppy state. Often used with verbs like 過ごす or する. Slangy, onomatopoeic feel.
休みの日は一日中うにうにして過ごした。
I spent the whole day off just lazing around aimlessly.
部屋がうにうにで、足の踏み場もない。
The room is in such a mess there's nowhere to step.
adverb, noun or participle which takes 'suru', adverb taking the 'to' particle
hazily; muddled; irritatedly
Describes a mental state of confusion, haziness, or mild irritation. Often used with する or 感じる. Slangy, mimetic.
寝不足で頭がうにうにして、何も考えられない。
My head feels all muddled from lack of sleep; I can't think straight.
彼の言い方にうにうにしたけど、何も言えなかった。
I felt irritated by the way he said it, but I couldn't say anything.