black

In a sentence

• Je préfère porter du noir en hiver.

  I prefer wearing black in the winter.

  Here, 'noir' is used as a noun representing the color black.

• La robe noire est élégante.

  The black dress is elegant.

  Here, 'noire' is an adjective that agrees in gender and number with the feminine singular noun 'robe'.

• Ses idées semblent parfois un peu noires.

  His ideas sometimes seem a bit dark.

  In this sentence, 'noires' metaphorically describes a mood or theme, emphasizing its figurative usage.