1: existing only as the product of unchecked imagination : fantastically visionary or improbable
2: given to fantastic schemes
(in Greek mythology) a fire-breathing monster with a lion's head, a goat's body, and a serpent's tail.
a thing which is hoped for but is illusory or impossible to achieve.
"the economic sovereignty you claim to defend is a chimera"
synonyms: illusion, fantasy, delusion, dream, fancy, figment of the imagination, will-o'-the-wisp, phantom, mirage...