Merriam-Webster's Collegiate® Dictionary, 11th Edition
FANTASTIC
I. adjective also fantastical see: fancy
Date: 14th century
1. based on fantasy ; not real, conceived or seemingly conceived by unrestrained fancy, so extreme as to challenge belief ; unbelievable , marked by extravagant fantasy or extreme individuality ; eccentric , excellent , superlative , fantasticality noun fantasticalness noun Synonyms: see: fantastic see: imaginary
II. noun
Date: 1598
eccentric 2