hugiaino (ὑγιαίνω, 5198), “to be healthy, sound in health” (Eng., “hygiene,” etc.), translated “safe and sound” in Luke 15:27, is used metaphorically of doctrine, 1 Tim. 1:10; 2 Tim. 4:3; Titus 1:9; 2:1; of words, 1 Tim. 6:3, RV (KJV, “wholesome,” RV marg., “healthful”); 2 Tim. 1:13; “in the faith,” Titus 1:13 (RV marg., “healthy”); “in faith,” Titus 2:2 (RV marg., ditto).