GRC
LSJ
Adv.
secretly, in secret, S. Ant. 85, 291, 1254, X. Smp. 5.8, etc. ; — Dor. κρυφᾷ; also ἐν κρυφῇ LXX Jd. 4.21, 9.31.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
heimlich, wie κρύφα ; κρυφῆ δὲ κεῦθε Soph. Ant. 85, öfter ; Xen. Symp. 5.8 ; Sp.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)
TBESG
κρυΦῇ
(prop. -ῆ, Rec.; later spelling is due to assimilation to dative; cf. εἰκῆ),
adv., [in LXX chiefly for סָתַר ;]
secretly, in secret: Eph.5:12.†
(AS)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars