Like sluggish and groggy, logy describes a person who is not able to think or move normally because of being tired, sick, etc., or something that moves slowly and ploddingly.

// The heavy meal left me feeling logy and in need of a nap.

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"The picture moves at a stately pace that one supposes was considered period-appropriate but feels merely logy at times." — Glenn Kenny, The New York Times, 15 May 2025

The origins of the word logy (sometimes spelled loggy) likely lie in the Dutch word log, meaning "heavy," a relation of the ancient German adjective luggich, meaning "lazy." The word shares no history with the log of campfires, which is centuries older and has probable Scandinavian roots. Likewise, it has no etymological connection to groggy, which describes someone weak and unsteady on the feet or in action. That word ultimately comes from the nickname of an English admiral: "Old Grog," concerned with the health of his crew, served diluted rum to his sailors, who returned the favor by dubbing the rum mixture grog. (Modern grog is typically rum, or another liquor, cut with water and served warm, sweetened, and with lemon.)