| mutism | Inability or refusal to speak. Origin: L. Mutus = unable to speak, inarticulate (18 Nov 1997) |
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| akinetic mutism | Subacute or chronic state of altered consciousness, in which the patient appears alert intermittently, but is not responsive, although his/her descending motor pathways appear intact; due to lesions of various cerebral structures. Synonym: coma vigil. (05 Mar 2000) |
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| voluntary mutism | Mutism due to psychogenic causes. Synonym: voluntary mutism. (05 Mar 2000) |
| elective mutism | Mutism due to psychogenic causes. Synonym: voluntary mutism. (05 Mar 2000) |