1. superlative form of cardboard; most resembling cardboard in texture, stiffness, or quality; most lacking in naturalness or authenticity
Usage: informal; superlative of 'cardboard' or 'cardboardy'

Examples

• That was the cardboardiest performance I've ever seen from an actor.
• The dialogue in the movie felt cardboardiest when the characters discussed their emotions.
• His cardboardiest smile didn't fool anyone at the party.
• The set design looked cardboardiest in the final scene.
• She gave the cardboardiest response to the interview question.