What actors and actresses appeared in Divorce sans merci - 1998?

You're likely thinking of the French film "Divorce à la Française" (1998), also known as "French Divorce".

The main cast includes:

* Catherine Frot as Claire

* Daniel Prévost as Philippe

* Alexandra Vandernoot as Isabelle

* Jean-Pierre Darroussin as Antoine

* Carole Bouquet as Louise

* Francis Huster as Jean-Pierre

Please note that there isn't a movie called "Divorce sans merci" from 1998. Perhaps you're remembering the title incorrectly.