N2 — outside your level filter
Modifies the end of the sentence directly and takes no だ／です, so there are no forms to conjugate.
にやにや
niyaniyasmirking, grinning to oneselfN2adverb
Example sentences2
彼は何かを思い出してにやにやしていた。
kare wa nanika o omoidashite niyaniya shite ita.
He was smirking to himself, remembering something. neutral
なんでさっきからにやにやしてるの？
nande sakki kara niyaniya shiteru no?
Why have you been smirking since a while ago? casual