Ergotropic is a term used to refer to an organism's response to stimuli which results in increased energy expenditure or work output. Synonyms for ergotropic include energetic, vigorous, active, and dynamic. These words all describe behaviors or reactions that require the organism to expend energy to complete them. Other synonyms for ergotropic include enthusiastic, lively, and spirited, which suggest a sense of excitement and passion in the organism's response. In contrast, synonyms such as lethargic, sluggish, and inert describe behaviors or reactions that require little energy expenditure or may be associated with a lack of motivation. Synonyms for ergotropic can be used to describe a wide range of biological and physiological responses to external stimuli.