Passe/pæˈseɪ/ Definition 1 of 2Pro Tip 1/3Context Matters Use 'passe' for trends or ideas that were once popular but not anymore. Saying 'rad' is so passe in today's slang. Pro Tip 2/3Cultural Change What's considered 'passe' can vary by culture and generation. In my parents' generation, not owning a car would've been passe. Pro Tip 3/3Subjectivity 'Passe' often reflects personal opinion, so use it carefully in conversations. He finds superhero movies passe, but I love them.