phantasmal (adj.)

• aerial
• airy
• apparent
• apparitional
• astral
• autistic
• chimeric
• deceptive
• delusional
• delusive
• delusory
• dreamlike
• dreamy
• erroneous
• ethereal
• fallacious
• false
• fantastic
• ghostlike
• ghostly
• illusional
• illusionary
• illusive
• illusory
• imaginary
• incorporeal
• misleading
• ostensible
• phantasmagoric
• phantom
• psychic
• seeming
• shadowy
• specious
• spectral
• spiritual
• supernatural
• supposititious
• unfounded
• unreal
• unsubstantial
• vaporous
• visionary
• wraithlike