Lethargy/ˈleθərdʒi/ Definition 1 of 2Pro Tip 1/3Emotionally Neutral Lethargy doesn't imply sadness or happiness, but a lack of energy. His lethargy made it hard for him to start the day. Pro Tip 2/3Not Always Negative Sometimes lethargy just means needing rest, without blame or criticism. The afternoon sun induced a pleasant lethargy over the beachgoers. Pro Tip 3/3Temporary State Lethargy often refers to a temporary state, rather than a permanent trait. A good night's sleep usually cures my bouts of lethargy.