An adjective is a word that describes a noun or pronoun. The major differences between adjectives in French and English concern agreement and placement. In French, an adjective is usually placed after the noun it modifies and must agree in gender and number with the noun. In English, an adjective usually comes before the noun it modifies and is invariable, that is, it does not agree.
Nancy est une femme sociable. Nancy is a sociable woman.
Ce sont des étudiants intelligents. They are smart students.
Danielle est une fille travailleuse. Danielle is a hard-working girl.