"fantastic" in the adjective sense
1. antic, fantastic, fantastical, grotesque
ludicrously odd
"Hamlet's assumed antic disposition"
"fantastic Halloween costumes"
"a grotesque reflection in the mirror"
2. fantastic, grand, howling, marvelous, marvellous, rattling, terrific, tremendous, wonderful, wondrous
extraordinarily good or great used especially as intensifiers
"a fantastic trip to the Orient"
"the film was fantastic!"
"a howling success"
"a marvelous collection of rare books"
"had a rattling conversation about politics"
"a tremendous achievement"
3. fantastic, wild
fanciful and unrealistic foolish
"a fantastic idea of his own importance"
4. fantastic, fantastical
existing in fancy only
"fantastic figures with bulbous heads the circumference of a bushel"- Nathaniel Hawthorne
5. fantastic
extravagantly fanciful in design, construction, appearance
"Gaudi's fantastic architecture"
Source: WordNet® (An amazing lexical database of English)
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