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behind closed doors behind someone's back by stealth clandestinely confidentially covertly furtively hush-hush in camera in confidence in holes and corners in secret in strict confidence insidiously intimately obscurely on the Q.T.

activity animation application ardor birr dash drive endurance enterprise exertion fire force forcefulness fortitude go hardihood initiative intensity juice life liveliness might moxie muscle

apathy dullness helplessness idleness impotence inability inactivity incompetence indifference indolence ineffectiveness inefficiency laziness lethargy powerlessness uselessness weakness