Inability, through muscular incoordination, to stand. [G. unsteadiness, from a-priv. + stasis, standing]
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n.
an inability to stand for which no physical cause can be found. Astasia-abasia is an inability to stand or walk in the absence of any recognizable physical illness. The patient's attempts are bizarre and careful examination reveals contradictory features. It is most commonly an expression of conversion disorder.
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asta·sia (as-taґzhə) [a-1 + Gr. stasis stand] motor incoordination with inability to stand; cf. dysstasia and posture. astatic adjMedical dictionary. 2011.