'Ninja arts' — but specifically the fictional, magic-powers version.

What a Japanese person actually thinks
Reads as pure entertainment. It's the vocabulary of 1960s ninja movies and of manga where people summon giant toads.

Meaning

Literally: endure/conceal + method
Actually: Ninja techniques. Where 忍術 (ninjutsu) can refer to historical practice, 忍法 is the pulp-fiction word — the one used for supernatural ninja powers in novels and films.

Scores

Naturalness●●●●●

Real word, firmly in the fiction register.

Coolness●●●●●

Fine characters, comic-book meaning.

Watch out

Nothing embarrassing lurking in here.

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忍 nin
to endure; a blade over the heart

The serious character underneath all the ninja vocabulary. A real virtue with a great etymology.

On skin

忍法

Orientation: either

Brush.