grossier, vulgaire, rudimentaire
It's crude.
C’est grossier.
— Moscow Does Not Believe in Tears (1980)
He's a crude man.
C'est un homme grossier.
I'm crude.
Je suis grossier.
— Do the Right Thing (1989)
You're really crude, Mookie.
Tu es vraiment grossier, Mookie.
That's crude.
— A Coffee in Berlin (2012)
His answer was crude.
Sa réponse était grossière.
Don't be crude.
Ne sois pas grossier.
The method was crude, but very effective.
La méthode était rudimentaire, mais très efficace.