なんnanとなくtonakuなんnantonakuなにnaniとなくtonakuなにnanitonaku
1.

In a way that lacks a specific or clear reason, often reflecting a feeling or state of being without precise intent.

2.

Describing a situation or action that occurs without direct thought or deliberate planning, often resulting in a sense of uncertainty.

3.

An expression of a vague feeling or inclination that arises without an explicit cause, leading to an ambiguous emotional response.

4.

A manner of experiencing or perceiving things that is undefined, as if carried by a fleeting mood or intuition rather than conscious decision.

Example:

私はなんとなく彼の家を見つけた。