Swimming and playing volleyball at the beach can make you tired and pleasantly wiped out, but long hours filling and emptying a wheelbarrow of dirt on a hot day brings fatigue, a far more draining kind of exhaustion.

There is a noticeable difference between tiredness and fatigue. You can read a magazine or book before bed and get tired after a while, but if you work on math problems on a computer for a long time, you'll feel fatigue in your eyes, and maybe your brain will start to hurt. The Latin fatīgāre means to "tire out," "to fill to excess or to bursting." Even thinking about the Latin for fatigue brings some mental fatigue.

Definitions of fatigue
  1. noun
    temporary loss of strength and energy resulting from hard physical or mental work
    “he was hospitalized for extreme fatigue
    “growing fatigue was apparent from the decline in the execution of their athletic skills”
    synonyms: tiredness, weariness
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    asthenopia, eyestrain
    a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem
    jet lag
    fatigue and sleep disturbance resulting from disruption of the body's normal circadian rhythm as a result of jet travel
    extreme fatigue
    a groggy state resulting from weariness
    logginess, loginess
    a dull and listless state resulting from weariness
    exhaustion resulting from lack of food
    a state of extreme exhaustion
    brain-fag, mental exhaustion
    exhaustion that affects mental keenness
    type of:
    temporary state
    a state that continues for a limited time
  2. noun
    used of materials (especially metals) in a weakened state caused by long stress
    “metal fatigue
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    type of:
    failing, weakness
    a flaw or weak point
  3. verb
    exhaust or get tired through overuse or great strain or stress
    synonyms: fag, fag out, jade, outwear, tire, tire out, wear, wear down, wear out, wear upon, weary
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    freshen, refresh, refreshen
    make fresh again
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    beat, exhaust, tucker, tucker out, wash up
    wear out completely
    overfatigue, overtire, overweary
    tire excessively
    exhaust physically or emotionally
    exhaust by allowing to pull on the line
    tire out completely
    type of:
    cause to feel unwell
  4. verb
    lose interest or become bored with something or somebody
    synonyms: jade, pall, tire, weary
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    conk out, peter out, poop out, run down, run out
    use up all one's strength and energy and stop working
    retire, withdraw
    lose interest
    back down, back off, bow out, chicken out, pull out
    remove oneself from an obligation
    type of:
    degenerate, deteriorate, devolve, drop
    grow worse
  5. noun
    (always used with a modifier) boredom resulting from overexposure to something
    “he was suffering from museum fatigue
    “after watching TV with her husband she had a bad case of football fatigue
    “the American public is experiencing scandal fatigue
    “political fatigue
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    type of:
    boredom, ennui, tedium
    the feeling of being bored by something tedious
  6. noun
    labor of a nonmilitary kind done by soldiers (cleaning or digging or draining or so on)
    “the soldiers were put on fatigue to teach them a lesson”
    “they were assigned to kitchen fatigues
    synonyms: fatigue duty
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    type of:
    assignment, duty assignment
    a duty that you are assigned to perform (especially in the armed forces)
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