Quiescent : in a state or period of inactivity or dormancy.Troublesome : causing difficulty or annoyance.Weak : lacking the power to perform physically demanding tasks; having little physical strength or energy.Indifferent : having no particular interest or sympathy; unconcerned.Unconcerned : showing a lack of worry or interest, especially when this is surprising or callous.Antonym of Quiescent is Troublesome