unstable; unsteady.
Physics. having no tendency to take a definite position or direction.
not static; unstable

having no tendency to assume any particular position or orientation
(of a galvanometer) having two mutually compensating magnets arranged so that the instrument is independent of the earth’s magnetic field


1827, from Greek astatos “unstable, not steadfast,” from a-, privative prefix (see a- (3)), + statos “placed, standing,” from PIE root *sta- (see stet).

astatic a·stat·ic (ə-stāt’ĭk)

Relating to astasia.

Unsteady; unstable.


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