Longman Dictionary of Contemporary English - fantastic

~ adj 1 extremely good, attractive, enjoyable etc  (You look fantastic! | Sounds like a fantastic idea to me.) 2 spoken used when someone has just told you something good  ("I've passed my driving test." "Fantastic!") 3 a fantastic amount is extremely large  (Teenagers spend fantastic amounts of money on clothes.) 4 a plan, suggestion etc that is fantastic is not likely to be possible 5 only before noun a fantastic story, creature, or place is very strange or unreal  (fantastic tales of dragons and fairy queens) - fantastically adv  (a fantastically expensive meal)