pipe dream

a conception or image created by the imagination and having no objective reality opening our own restaurant has long been a pipe dream Synonyms chimera, conceit, daydream, delusion, dream, fancy, figment, hallucination, illusion, nonentity, phantasm (also fantasm), fantasy, unreality, visionRelated Words ignis fatuus, mirage, will-o'-the-wisp; brainchild, idea; concoction, fable, fabrication, fiction, invention; envisaging, imaging, visualization; cloud-cuckoo-land, cloudland, Shangri-la, utopia; daymare, nightmareNear Antonyms actuality, fact, reality