Hello!
You have several words for it :
Words not vulgar :
Fainéant ( masc )
Fainéante ( fem )
Words not vulgar :
Paresseux ( masc )
Paresseuse ( fem )
Words vulgar :
Flemmard ( masc )
Flemmarde ( fem )
But the first meaning of lazy in french is :
Paresseux
Paresseuse
Bye and don’t forget I’m proud of you!!<33