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; lack of energy : she was overcome by lassitude and retired to bed | a patient complaining of lassitude and inability to concentrate. prolonged periods of lassitude lethargy, listlessness, weariness, languor, sluggishness, tiredness, fatigue, torpor, lifelessness, apathy. antonym vigor.
Dictionary entry overview: What does conservation of energy mean? â¢ CONSERVATION OF ENERGY (noun) The noun CONSERVATION OF ENERGY has 1 sense: 1. the fundamental principle of physics that the total energy of an isolated system is constant despite internal changes Familiarity information: CONSERVATION OF ENERGY used as a noun is very rare.