In French, adjectives ending in -eux have a specific feminine form.
Learn how to make the feminine form of adjectives ending in -eux in French
Look at these adjectives:
Il est heureux à Paris, et elle est heureuse à Londres.He's happy in Paris, and she's happy in London.
C'est un livre ennuyeux. -Oui, cette histoire est ennuyeuse.This is a boring book. -Yes, this story is boring.
Adjectives ending in -eux in the masculine form become -euse in the feminine form.
Note that many of the English equivalents end in "-ous"
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