Definition
That's unheard of!: That's never happened before! That's a first! That's unprecedented!
- "And you're all on time! That's unheard of!"
Still unsure of the best way to use 'That's unheard of'? Improve your English thanks to our online English lessons. We offer a free test as well as a free level assessment!
What our users say:
Test your English with Gymglish today and get a free level assessment
Absolutely free - no strings attached.