phantasmagoric (adj.)

• airy
• apparent
• apparitional
• autistic
• chimeric
• deceptive
• delusional
• delusive
• delusory
• dreamlike
• dreamy
• erroneous
• fallacious
• false
• fantastic
• illusional
• illusionary
• illusive
• illusory
• imaginary
• misleading
• ostensible
• phantasmal
• phantom
• seeming
• specious
• spectral
• supposititious
• unfounded
• unreal
• unsubstantial
• visionary