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Lethargic is a word that means tired, lazy sluggish, so antonyms of lethargic would be energetic and active.
I feel a little lethargic today.
people r lethargic on rainy days
David's movements were lethargic most of the time.
She was lethargic after she learned that her best friend was moving away.
The news that he would be laid off made the man lethargic.