To weary with labor or any bodily or mental exertion; lessen or exhaust the strength of by severe or long-continued exertion, by trouble, by anything that harasses, etc.; tire.Synonyms Weary, Jade, etc. See tire, verbn. A feeling of weariness following bodily labor or mental exertion; a sense of loss or exhaustion of strength after exertion, trouble, etc.n. A cause or source of weariness; labor; toil: as, the fatigues of war.n. Specifically The labors of military men distinct from the use of arms; fatigue-duty: as, a party of men on fatigue.n. The weakening of a metal bar by the repeated application and removal of a load considerably less than the breaking-weight of the bar, as when car-axles break from the repeated blows and strains which they experience.n. Synonyms Fatigue, Weariness, Lassitude. Fatigue is more often physical, but also mental, and is generally the result of active and strenuous exertion: as, the fatigue of ten hours' work, or of close application to books. Weariness may be the same as fatigue; it is, more often than fatigue, the result of less obvious causes, as long sitting or standing in one position, importunity from others, delays, and the like. Fatigue and weariness are natural conditions, from which one easily recovers by rest. Lassitude is a relaxation with languor, the result of greater fatigue or weariness than one can well bear, and may be of the nature of ill health. The word may, however, be used in a lighter sense.