Synonyms for fantastic

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1. Based on or suggesting fantasy

   whimsical, capricious, extravagant, freakish, strange, odd, queer, quaint, singular, peculiar, outlandish, bizarre, weird, farfetched, erratic, wonderful, comical, foreign, exotic, fabulous, extreme, ludicrous, ridiculous, preposterous, implausible, unreal, grotesque, chimerical, fanciful, eccentric, absurd, vague, illusive, imaginary, hallucinatory, phantasmagoric, high-flown, affected, mannered, artificial, baroque, out of sight*, far-out*.

   Antonyms conventional, ordinary, real.

2. Seemingly impossible

   incredible, unbelievable, phenomenal; see excellent, unbelievable 1.

fantastic implies a lack of restraint in imagination, suggesting that which is extravagantly fanciful or unreal in design, conception, construction, etc. fantastic notions; bizarre suggests that which is extraordinarily eccentric or strange because of startling incongruities, extreme contrasts, etc. music with a bizarre atonality; grotesque suggests a ludicrously unnatural distortion of the normal or real, or a fantastic combination of elements the grotesque grimaces of the comedian