Entomology definition of Lethargic September 9, 2014 Raj Entomology Dictionary 0 Please Like Us!!! DesiGoogly.com > Education News > Entomology Dictionary > Entomology definition of Lethargic Entomology definition of Lethargic: torpid or inactive. Entomology Lethargic definitionLethargic Entomology explanationLethargic Entomology meaningReviews & Comments