'astasia' originates from Greek, specifically the word 'astasis' (ἀστάσις), where the prefix 'a-' meant 'without' and 'stasis' meant 'standing'.

'astasia' changed from the Greek word 'astasis' into New (Medical) Latin 'astasia' and eventually became the modern English medical term 'astasia'.

Initially, it meant 'lack of standing or posture', but over time it evolved into the clinical sense 'inability to stand', often used in neurology and psychiatry.