In French, the adjectives ending in -oux (as well as the adjective faux) have a specific ending in the feminine form.
The feminine form of adjectives ending in -oux in French
Look at these examples:
The rule for adjectives ending in -oux is to become -ouse in the feminine form.
rousse and douce are very common exceptions to that rule!
The adjective faux is a particular case: it becomes fausse in the feminine form!
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Learn more about these related French grammar topics
Examples and resources
Mon exercice était faux: j'ai donné une réponse fausse.My exercise was wrong: I gave a wrong answer.