lethargic - Definition | Dictionary definition of lethargic

Definition of lethargic

deficient in alertness or activity

"bullfrogs became lethargic with the first cold nights"

Synonyms:: unenrgetic; inactive
not active physically or mentally; dazed, foggy, groggy, logy, stuporous
stunned or confused and slow to react (as from blows or drunkenness or exhaustion); dreamy, lackadaisical, languid, languorous
lacking spirit or liveliness; listless
lacking zest or vivacity

Antonyms:: energetic
possessing or exerting or displaying energy; active
characterized by energetic activity; lively
full of life and energy; dynamic, dynamical
characterized by action or forcefulness or force of personality; enterprising
marked by imagination, initiative, and readiness to undertake new projects; spirited
displaying animation, vigor, or liveliness; physical
characterized by energetic bodily activity; alert, brisk, merry, rattling, snappy, spanking, zippy
quick and energetic; canty
lively and brisk; driving
acting with vigor; high-energy
providing a relatively large amount of energy upon undergoing a chemical reaction; indefatigable, tireless, unflagging, unwearying
showing sustained enthusiastic action with unflagging vitality; strenuous
characterized by or performed with much energy or force; vigorous
characterized by forceful and energetic action or activity; show more antonyms...