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somnolent vs. lethargic

somnolent
[som-nuh-luhnt] / ˈsɒm nə lənt /

adjective

  1. sleepy; drowsy.

    Synonyms:
    slumberous

  2. tending to cause sleep.

    Synonyms:
    soporific, somniferous
lethargic
[luh-thahr-jik] / ləˈθɑr dʒɪk /
Rarely lethargical

adjective

  1. of, relating to, or affected with lethargy; drowsy; sluggish; apathetic.

    Synonyms:
    torpid, indolent, lazy

  2. producing lethargy.

    The lethargic heat and humidity of the day made me want to do nothing but nap.