quixotic (adj.)

• absurd
• airy
• autistic
• chimerical
• dreamlike
• dreamy
• fanciful
• fantastic
• foolhardy
• idealistic
• impracticable
• impractical
• mad
• optimistic
• otherworldly
• poetic
• preposterous
• rash
• reckless
• ridiculous
• romantic
• starry-eyed
• transcendental
• transmundane
• unrealistic
• unrealizable
• visionary
• wild