1. impossible or unable to be repeated or done again
2. too offensive, vulgar, or inappropriate to be said again
Usage: informal

Examples

• The magic of that sunset was unrepeatable.
• Her performance was an unrepeatable moment in theater history.
• The experiment produced unrepeatable results due to changing conditions.
• He used unrepeatable language when he stubbed his toe.
• The once-in-a-lifetime opportunity was truly unrepeatable.
• Their chemistry on stage created an unrepeatable experience for the audience.