1. extremely good; excellent
Usage: informal
2. very large in amount or degree
3. strange and imaginative; not based in reality

Examples

• The concert was fantastic – the best I've ever seen.
• She did a fantastic job on her presentation.
• The company spent a fantastic amount of money on advertising.
• The movie featured fantastic creatures from another world.
• His fantastic stories about talking animals delighted the children.
• The artist created fantastic landscapes that seemed otherworldly.