Learn French: L'homme spirituel marche nu-pieds pour la paix intérieure. - The spiritual man walks barefoot for inner peace.

When the adjective nu (naked or bare) is placed before the noun, it is joined with a hyphen and remains invariable. It does not change to match the gender or number of the noun. That is why it stays nu instead of becoming nus.

How would the sentence change if we put nu after pieds?

If nu comes after the noun, it acts like a normal adjective and must agree in gender and number. Since pied is masculine and plural, it would become pieds nus. You could rewrite this as marche les pieds nus, but marcher nu-pieds is a very common fixed phrase.

Why is there no article like les before nu-pieds?

In this sentence, nu-pieds is acting as an adverbial phrase describing exactly how the man walks. Because it is functioning as an adverb rather than a standalone noun, it does not need an article.

Why does intérieure take an 'e' at the end?

The adjective intérieur must agree with the noun it modifies, which is paix (peace). Since paix is a feminine noun, we must use the feminine adjective form intérieure.