(a.) Pertaining to, involving, or caused by, imagination.

Barmecidal Barmecide airy apparent apparitional autistic chimeric deceptive delusional delusionary delusive delusory dereistic dreamlike dreamy erroneous fallacious FALSE fancied fantastic fictive illusional illusionary illusive illusory imaginary imaginational imagined misleading nonexistent notional ostensible phantasmagoric phantasmal phantom seeming self-deceptive self-deluding specious spectral supposititious unactual unfounded unreal unsubstantial visional visionary