G4993 σωφρονέω (sōphronéō)

KJV renderings: be in right mind, be sober (minded), soberly
Strong's definition: to be of sound mind, i.e. sane, (figuratively) moderate
Derivation: from G4998 (σώφρων);

From James Strong's public-domain dictionaries (G), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.