unobservable

unobservable

(ˌʌnəbˈzɜːvəbəl)

adj

incapable of observation; imperceptible

n

the unobservable something that cannot be observed

Thesaurus

Adj.

1.

unobservable - not accessible to direct observation imperceptible, unperceivable - impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"

unobservable

adjective

Incapable of being apprehended by the mind or the senses:

impalpable, imperceptible, imponderable, inappreciable, indiscernible, indistinguishable, insensible, intangible, invisible, unnoticeable.