Used when the speaker is unsure of the exact nature of something, often with a nuance of vagueness or indirectness. Similar to 何か but slightly more formal or literary.
See also: 何か (なにか)
He is reading some kind of difficult book.
There's some kind of nice smell coming from the kitchen.
Expresses that something happens without a clear reason, often with a sense of mild surprise or curiosity. Similar to なぜか but softer.
See also: 何か (なにか)
For some reason I feel good today.
He suddenly started laughing for some reason.
It looks like there's something inside the box.
For some reason I felt lonely.
It seems something happened.
There's some commotion going on outside, for some reason.