Frais, long, favori, rigolo have irregular feminine forms (French adjectives)

In French, the adjectives frais, long and rigolo have irregular feminine forms. 

The feminine form of the adjectives frais, long and rigolo in French

Look at these sentences:

L'eau est assez fraîche.The water is quite cold.

Ma jupe est longue.My skirt is long.

C'est ma chanson favorite.It's my favourite song.

Ma petite sœur est rigolote !My little sister is funny!

These adjectives are completely irregular in the feminine form:

frais -> fraîche (fresh)

Note that fraiche is also acceptable following the 1990 Spelling Reform.

long ->longue (long)

favori -> favorite (favourite)

rigolo ->rigolote (funny)

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Examples and resources

Ma petite sœur est rigolote !My little sister is funny!
L'eau est assez fraîche.The water is quite cold.
Ma jupe est longue.My skirt is long.
C'est ma chanson favorite.It's my favourite song.
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