unobservable
Speech parts
1. unobservable - Noun
2. unobservable - Adjective
3. unobservable - Adjective Satellite
Meaning
not accessible to direct observation
Source: WordNetSynonyms
Antonyms
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Although parts of the constellation technically rise above the horizon to observers between the 49°N and 65°N, stars within a few degrees of the horizon are to all intents and purposes unobservable.
An image taken at the Anglo-Australian Telescope in 1993 was found to show the then-unnoticed comet some 13 AU from the Sun, citation a distance at which most comets are essentially unobservable.
Diastolic blood pressure is non-palpable and unobservable by tactile methods, occurring between heartbeats.
In this view, the uniformity of scientific laws is an unprovable postulate which enables scientists to extrapolate into the unobservable past.
Heisenberg's paper did not admit any unobservable quantities like the exact position of the electron in an orbit at any time; he only allowed the theorist to talk about the Fourier components of the motion.
If a state is not observable, the controller will never be able to determine the behaviour of an unobservable state and hence cannot use it to stabilize the system.