marvelous

Synonyms: astonishing astounding awe-inspiring awesome awful bewildering breathtaking confounding difficult to believe extraordinary fabulous fantastic implausible improbable incomprehensible inconceivable incredible miraculous phenomenal prodigious remarkable singular spectacular staggering strange striking stunning stupendous supernatural surprising unbelievable unimaginable unlikely unusual wonderful wondrous

Antonyms: believable expected ordinary plain unamazing

Synonyms: agreeable astonishing bad boss colossal cool divine dreamy enjoyable excellent fab fabulous fantastic glorious greatest groovy hot keen magnificent neat out of this world outrageous peachy pleasant pleasurable prime rewarding satisfying sensational smashing solid solid gold spectacular splendid stupendous super supreme swell terrific wonderful

Antonyms: inconsiderable insignificant paltry worthless