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n.
physical energy or intensity; "he hit with all the force he could muster"; "it was destroyed by the strength of the gale"; "a government has not the vitality and forcefulness of a living man"
n.
a serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal
n.
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"; "weariness overcame her after twelve hours and she fell asleep"
n.
condition in which there is a disturbance of normal functioning; "the doctor prescribed some medicine for the disorder"; "everyone gets stomach upsets from time to time"