The meaning of FANTASTIC is based on fantasy : not real. How to use fantastic in a sentence. Synonym Discussion of Fantastic.

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FANTASTIC definition: 1. extremely good: 2. strange and imaginary, or not reasonable: 3. very unusual, strange, or…. Learn more.

FANTASTIC definition: extraordinarily good; excellent. See examples of fantastic used in a sentence.

Fantastic describes what seems to have slight relation to the real world because of its strangeness or extravagance: fantastic imaginary beasts such as the unicorn.

Definition of fantastic adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Fantastic suggests a wild lack of restraint, a fancifulness so extreme as to lose touch with reality: a fantastic scheme for a series of space cities. In informal use, fantastic often means simply …

Feb 3, 2026 · Adjective fantastic (comparative more fantastic, superlative most fantastic) Wonderful; marvelous; excellent; extraordinarily good or great (used especially as an intensifier).

If you say that something is fantastic, you are emphasizing that you think it is very good or that you like it a lot.

We had a fantastic [= great, wonderful] time! The train runs at fantastic speeds. He concocted a fantastic [= wild, outlandish] scheme to rob the casino. My sister buys fantastically expensive clothes.