なんとなく
nantonaku
somehow or other, for some reason or another
Example sentences
彼はなんとなく僕に恨みをもっているようだ。
I don't know why, but he seems to have it in for me.
私はなんとなく彼の家を見つけた。
Somehow or other I found his house.
彼女と付き合うきっかけになったのは、なんとなくフィーリングが合ったからだ。
I got together with her mainly because we seemed to share the same feelings about things.