Look at these examples:
Il est jaloux. -Non, elle est jalouse.
He is jealous. -No, she is jealous.
Il connaît un garçon roux et une fille rousse.
He knows a red-haired boy and a red-haired girl.
Pour m'endormir, j'ai besoin d'un drap doux et d'une chanson douce.
To fall asleep, I need a sweet sheet and a sweet/soft song.
Note that the rule for adjectives ending in -oux is to become -ouse in the feminine form.
HOWEVER, rousse and douce are very common exceptions to that rule!
ATTENTION: the adjective faux is a particular case: it becomes fausse in the feminine form!
Mon exercice était faux: j'ai donné une réponse fausse.
My exercise was wrong: I gave a wrong answer.
Learn more about these related French grammar topics
Examples and resources

Il connaît un garçon roux et une fille rousse.
He knows a red-haired boy and a red-haired girl.
Il est jaloux. -Non, elle est jalouse.
He is jealous. -No, she is jealous.
Pour m'endormir, j'ai besoin d'un drap doux et d'une chanson douce.
To fall asleep, I need a sweet sheet and a sweet/soft song.
Mon exercice était faux: j'ai donné une réponse fausse.
My exercise was wrong: I gave a wrong answer.
duo
Kwiziq community member
1 October 2017
1 reply
there are no liaisons between et and une.
Ron
Kwiziq community member
4 October 2017
4/10/17