Dictionary:

astasia

  (ə-stā'zhə)

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Inability to stand because of motor incoordination.

[Greek, unsteadiness, from astatos, unsteady : a-, not; see a–¹ + statos, standing.]

The inability to stand due to muscular incoordination.

Motor incoordination with inability to stand.

• a.–abasia — inability or refusal to stand or walk although the legs are otherwise under control.

The noun has one meaning:

Meaning #1: inability to stand due to muscular incoordination