adverb, noun or participle which takes 'suru'
with a stab; with a thrust; plunging into
Describes the action of something sharp piercing something soft, often with a sense of suddenness or force. Used adverbially or with する.
ナイフをぶすっと刺した。
He stabbed the knife in with a thrust.
注射針がぶすっ
The needle went in with a plunge.
adverb, noun or participle which takes 'suru'
sullenly; sulkily; glumly
Describes a person's mood or expression as sullen, sulky, or sour. Often used with verbs like する or している to indicate a sulking attitude.
彼はぶすっとして何も言わなかった。
He was sulking and didn't say anything.
ぶすっとした顔で座っている。
She is sitting there with a sullen face.