1. beyond belief or understanding
Similar word(s): flimsy, unconvincing, astounding, dumbfounding, dumfounding, fabulous, improbable, marvellous, marvelous, tall, undreamed, undreamt, unimagined, incredulous, implausible, unthinkable, incredible
2. having a probability too low to inspire belief
Sentences with unbelievable as an adjective:
- The most unbelievable thing happened to me today!
- This restaurant makes unbelievable pizza!
- His excuse seems rather unbelievable.