Synonyms of 'fantastic'
very large or impressive
I felt a tremendous pressure on my chest.
I smiled sincerely, to encourage him to buy this unlikely story.
existing only in the imagination or giving the impression of doing so
There are few more unreal worlds than that of the celebrity.
unusually large in size, degree, or number
farmers who own vast stretches of land
humongous or humungous (US, slang)
of or like visions
the visionary worlds created by fantasy writers
strange or bizarre
I don't like that guy - he's really weird.
unusual, playful, and fanciful
He had an offbeat, whimsical sense of humour.
without reason or substance
I was just a kid and full of wild ideas.
being as good as anyone else in the world in a particular field
He was determined to become a world-class tennis player.
Video: pronunciation of 'fantastic'
Thesaurus for fantastic from the Collins English Thesaurus