Resembling a dead body; stiff, pale, motionless, or appearing lifeless and lacking vitality.
From corpse (dead body) + like (resembling). The compound form developed in English to vividly describe something that looks dead or deathlike.
Writers love using 'corpselike' to describe people in shock or extreme illness—it's more vivid than just saying 'pale' because it evokes that eerie stillness and the total absence of life energy.
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