← BackshareGuesssthenia/ˈsθiːniə/nounStrength, vigor, or energy; a state of being strong and active.After a week of rest, she felt a return of sthenia.The doctor noted the patient's sthenia as a good sign for recovery.The athlete's sthenia was evident in her powerful performance.SynonymsvigorstrengthenergyAntonymsastheniaweakness