Strong's G4998 · Greek

σώφρων

sophron · so'-frone

from the base of 4982 and that of 5424; safe (sound) in mind, i.e. self-controlled (moderate as to opinion or passion)

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 4 ** σώφρων , -ον [in LXX: IV Mac 9 * ;] of sound mind, sane, sensible ; self-controlled, sober-minded : I Ti 3:2 , Tit 1:8 2:2 , 5 (Arist.).† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain