lethargic
luh-THAR-jikadjMeaning sluggish and drowsy; lacking energy
Memory hook LETH-ARGH-ic: “Argh… later”. The monkey bounces around shouting “Come and play!”, but the sloth just groans, “Argh… later.” The sloth is lethargic.
The heat made everyone lethargic, and no one wanted to play outside.
In context After the long overnight flight, the travelers were lethargic; they shuffled slowly through the airport, yawning and barely speaking.
Similar sluggish, drowsy, listless, sleepy
Opposite energetic, lively, vigorous
From Greek lethargos, “forgetful, drowsy”: lethe (forgetting) + argos (idle).