1. lacking strong emotion, enthusiasm, or intensity
2. lacking romantic or sexual desire

Examples

• His passionless delivery made the speech boring to listen to.
• She gave a passionless performance that failed to move the audience.
• Their marriage had become passionless after many years together.
• The critic described the film as technically competent but passionless.
• He approached the project in a passionless, methodical way.
• Her passionless response to the proposal surprised everyone.