1 (informal) extremely good; excellent
SYNGREAT, BRILLIANT:
a fantastic beach in Australia * a fantastic achievement * The weather was absolutely fantastic. * You've got the job? Fantastic!
2 (informal) very large; larger than you expected
SYNENORMOUS, AMAZING:
The response to our appeal was fantastic. * The car costs a fantastic amount of money.
3 (also less frequent fantastical) [usuallybeforenoun] strange and imaginative
SYNWEIRD:
fantastic dreams of forests and jungles
4 impossible to put into practice:
a fantastic scheme / project
fantastically adverb:
fantastically expensive / successful * a fantastically shaped piece of stone
