Lacking life, spirit, energy, or the appearance of being alive; made lifeless or depressed.
Past participle of disanimate. The prefix dis- combines with animate (from Latin anima, 'soul') to express the removal of living quality or vitality.
A disanimated voice or expression is different from just being quiet—it suggests something has actively lost its life force, which is why this word perfectly describes the eerie feeling of talking to someone who seems 'checked out' emotionally.
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