un apparent (adjective) impalpable: intangible, unsubstantial
Sinonime: airy,
delicate, disembodied,
fine,
imperceptible, imponderable, imprecise, inappreciable, incorporeal, indiscernible,
indistinct, insensible,
insubstantial,
nebulous, shadowy,
tenuous,
thin, unapparent, unobservable, unperceivable,
vagueAntonime: believeable,
palpable,
perceptible,
substantial,
tangible,
understandable