This is the 2967th most frequent French word.
heureuse
The French word "heureuse" means "happy" or "fortunate" (feminine form).
The word 'heureuse' is used as an adjective to describe the feminine subject 'Elle', meaning 'happy'.
Elle est heureuse aujourd'hui.
She is happy today.
Here, 'heureuse' is used as an adjective to subsequently describe multiple feminine subjects influenced by the action conveyed in the sentence.
Son sourire joyeux rend tout le monde heureuse.
Her joyful smile makes everyone happy.
In this sentence, 'heureuse' is again an adjective describing the state of the feminine speaker 'Je', expressing a personal feeling.