1. Showing sustained enthusiastic action with unflagging vitality
   - indefatigable, tireless, unflagging

See also: energetic

• eider
• eider duck
• eiderdown
• eidetic
• eidolon
• eidos
• Eiffel
• Eiffel Tower
• Eigen
• eigenstate
• eigenvalue
• eigenvalue of a matrix
• eigenvalue of a square matrix
• eigenvector
• eight
• eight ball
• eight-day
• eight-membered
• eight-sided
• eight-spot
• eighteen
• eighteenth
• Eighteenth Amendment
• eighter
• eighter from Decatur