The short version of 諸行無常. Same idea, two characters, less funereal.

What a Japanese person actually thinks
Contemplative rather than mournful. Lighter on its feet than the four-character version, which reads specifically like a memorial.

Meaning

Literally: no + constancy
Actually: Impermanence — nothing holds its form. The Buddhist concept, without the full doctrinal phrase.

Scores

Naturalness●●●●●

Established term.

Coolness●●●●●

Clean two-character balance, real philosophical content, no ambiguity.

Watch out

Nothing embarrassing lurking in here.

On skin

無常

Orientation: either

Mincho.