lethargic

When you feel lethargic, you're sluggish or lacking energy. Being sleepy or hungry can make anyone lethargic.

Being lethargic makes it hard to get anything done: you feel weak and sleepy. Whatever the reason, a lethargic person needs to snap out of it and get some energy, maybe by eating something or by taking a nap. Being lethargic also goes well with watching TV, since that takes almost no energy at all. When you feel lethargic, you don't have any energy to spare.

Definitions of lethargic
  1. adjective
    deficient in alertness or activity
    “bullfrogs became lethargic with the first cold nights”
    synonyms: unenergetic
    inactive
    not active physically or mentally
    dazed, foggy, groggy, logy, stuporous
    stunned or confused and slow to react (as from blows or drunkenness or exhaustion)
    dreamy, lackadaisical, languid, languorous
    lacking spirit or liveliness
    listless
    lacking zest or vivacity
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    Antonyms:
    energetic
    possessing or exerting or displaying energy
    active
    characterized by energetic activity
    lively
    full of life and energy
    dynamic, dynamical
    characterized by action or forcefulness or force of personality
    physical
    characterized by energetic bodily activity
    alert, brisk, lively, merry, rattling, snappy, spanking, zippy
    quick and energetic
    canty
    lively and brisk
    driving
    acting with vigor
    high-energy
    providing a relatively large amount of energy upon undergoing a chemical reaction
    indefatigable, tireless, unflagging, unwearying
    showing sustained enthusiastic action with unflagging vitality
    strenuous
    characterized by or performed with much energy or force
    vigorous
    characterized by forceful and energetic action or activity
    enterprising
    marked by imagination, initiative, and readiness to undertake new projects
    spirited
    displaying animation, vigor, or liveliness
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