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.
ひとりでに
hitorideniof its own accord, by itselfN2adverb
Example sentences2
ドアがひとりでに開いた。
doa ga hitorideni aita.
The door opened by itself. neutral
このパソコン、たまにひとりでに再起動するんだ。困る。
kono pasokon, tama ni hitorideni saikidou suru n da. komaru.
This computer sometimes restarts on its own. It's annoying. casual