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somnolent vs. lethargic

somnolent

[ som-nuh-luhnt ]
adjective
  1. sleepy; drowsy.
  2. tending to cause sleep.

lethargic

[ luh-thahr-jik ]
adjective
  1. of, relating to, or affected with lethargy; drowsy; sluggish; apathetic.
  2. producing lethargy: The lethargic heat and humidity of the day made me want to do nothing but nap.

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