In French, to make an adjective feminine, you must add an -e at the end. This is valid for most adjectives.
Learn how to form feminine adjectives in French
Look at this example:
In French, the "describing word"/adjective (here petit) changes according to whether the object it refers to is masculine (un chat) or feminine (une souris).
As other regular adjectives, petit simply takes an -e in the feminine form (une petite souris).
Here are more examples:
See also Most adjectives can be made plural by adding -s in French
Adjectives ending with mute -e don't change in the feminine in French
and Colour descriptions change according to gender and number (French Colour Adjectives)
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