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Definition of phantasmal : Pertaining to, of the nature of, or resembling, a phantasm; spectral; illusive.

Synonyms:

spiritual, ghostlike, phantasmagoric, hallucinatory, dreamlike, unearthly, chimeric, religious, ghostly, supernatural, real, delusory, delusive, fanciful, visionary, illusive, phantasmic, imaginary

impalpable, null, tenuous, empty, intangible, weightless, unreal, ethereal, chimerical, spectral, vacuous, illusory, inessential, apparitional, immaterial, unsubstantial, unconcrete, vacant, nonexistence, insignificance

Usage examples:

• Much of this Friedrich's life has gone off like the smoke of fire- works, has faded sorrowfully, and proved phantasmal. - "History Of Friedrich II. of Prussia, Vol. III. (of XXI.) Frederick The Great--The Hohenzollerns In Brandenburg--1412-1718", Thomas Carlyle.
• Above the baying of phantasmal hounds that pressed him hard and drove him on, with never rest or mercy; above the lashing of a spectral whip that curled about his limbs, sang in his ears, and continually stung him forward; above the outcries of the unclean shapes that thronged about him,- he could still distinguish one real sound,- the rush and sweep of hurrying waters. - "Mrs. Skaggs's Husbands and Other Stories", Bret Harte.
• Long before this essay was written or published, I had been struck by this phantasmal dream- like quality in some of Stevenson's works, which I was puzzled to account for, until I read this extraordinary explanation, for explanation it undoubtedly affords. - "Robert Louis Stevenson a Record, an Estimate, and a Memorial", Alexander H. Japp.