Adjective – Fantastic
1 : extremely good
That meal was fantastic! (=excellent, terrific)
We had a fantastic (=great, wonderful) time!
2 : extremely high or great
The train runs at fantastic speeds.
3 also fantastical /fænˈtæstɪkəl/ : very strange, unusual, or unlikely
He concocted a fantastical (=wild, outlandish) scheme to rob the casino.