unergetic
1. [ adjective ] deficient in alertness or activity
Synonyms: lethargic
Examples:

"bullfrogs became lethargic with the first cold nights"

Related terms: energetic dreamy dazed listless inactive
Similar spelling:   unerect
  unrouged
  unrigged
  unregretting
  unrighteous
  unrest
  unregretful