part of speech: adjective

definition 1: wildly imaginative and incredible.

  • Her brother told a fantastic story about being kidnapped by wolves.

synonyms: sensational

definition 2: strange or unusual.

  • We read about the fantastic life forms on the ocean floor.

synonyms: peculiar, queer, strange

antonyms: ordinary

definition 3: (informal) excellent or superb.

  • She was a fantastic singer when she was young.

synonyms: excellent, exceptional, marvelous, outstanding, superb, terrific

antonyms: ordinary

derivations: fantastical (adj.), fantastically (adv.)