Acting to counteract lethargy, sluggishness, or lack of energy.
From anti- + lethargic (sluggish, from Greek lethe, forgetfulness, + argos, idle). Combines ancient Greek terms for 'forgetting' and 'idleness.'
Coffee is antilethargic—it fights the sluggishness of morning or fatigue. It's a medical way of describing anything that perks you up.
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