weariness from bodily or mental exertion.

a cause of weariness; slow ordeal; exertion

the fatigue of driving for many hours.

Physiology . temporary diminution of the irritability or functioning of organs, tissues, or cells after excessive exertion or stimulation.

Civil Engineering . the weakening or breakdown of material subjected to stress, esp. a repeated series of stresses.

Also called fatigue duty. Military .

labor of a generally nonmilitary kind done by soldiers, such as cleaning up an area, digging drainage ditches, or raking leaves.

the state of being engaged in such labor

on fatigue.

fatigues, Military . fatigue clothes.

of or pertaining to fatigues or any clothing made to resemble them

The guerrilla band wore fatigue pants and field jackets. She brought fatigue shorts to wear on the hike.

to weary with bodily or mental exertion; exhaust the strength of

Endless chatter fatigues me.

Civil Engineering . to subject (a material) to fatigue.

to become fatigued.

Civil Engineering . (of a material) to undergo fatigue.

noun

energy , freshness , liveliness , spirit , vigor

verb

energize , envigorate , refresh

noun

brain fag , burnout , debility , dullness , enervation , ennui , exhaustion , faintness , fatigation , feebleness , heaviness , languor , lassitude , lethargy , listlessness , overtiredness , weakness , weariness , tiredness , dyspnea , hypokinesia , hypokinesis , impuissance

verb

bedraggle , burn out * , bush * , conk out * , debilitate , deplete , disable , drain , droop , drop , enervate , exhaust , fag , fizzle , flag , jade , knock out * , languish , overtire , peter out * , poop , poop out * , prostrate , sag , sink , succumb , take , tucker , weaken , wear down , weary , tire , wear , wear out , bore , languor