Women (gunaikas). Accusative with dei einai understood (hosautōs, likewise) as in 1Ti 3:8. Apparently “women as deacons” (Rom 16:1 about Phoebe) and not women in general or just “wives of deacons.” See Pliny (Ep. X. 97) ministrae.
Not slanderers (mē diabolous). Original meaning of diabolos (from diaballō, Luk 16:1), the devil being the chief slanderer (Eph 6:11). “She-devils” in reality (Tit 2:3). “While men are more prone to be dilogous, double-tongued, women are more prone than men to be slanderers” (White).
Faithful in all things (pistas en pāsin). Perhaps as almoners (Ellicott) the deaconesses had special temptations.