なにげ何気nanigeないnai
1.

Describing a manner or action that appears effortless and without intention, often conveying a sense of ease and spontaneity.

2.

Characterizing behavior that is not meant to draw attention, often showing a lack of formality or seriousness in social interactions.

3.

Reflecting a state of being where one engages in everyday moments without specific significance or deeper thought, creating a sense of simplicity and tranquility.

Example:

何気なく言った言葉も誰かを傷つけることがある。