chimerical

Adjective

• produced by a wildly fanciful imagination
  • his Utopia is not a chimerical commonwealth but a practical improvement on what already exists- Douglas Bush
    

• being or relating to or like a chimera
  • his Utopia is not as chimeric commonwealth but a practical improvement on what already exists- Douglas Bush
    

Related words

• Synonyms: 
  chimeric , chimeral