Lexical Definition

‎ἐξάπινα‎ exápina (ex-ap'-ee-nah) suddenly ^G:ADV
from ‎ἐκ‎ and a derivative of the same as ‎αἰφνίδιος‎

suddenly.

• of a sudden, i.e. unexpectedly

Abbott-Smith

† ἐξάπινα = ἐξαπίνης, ἐξαίφνης (q.v.), [in LXX for פִּתְאוֹם, etc. ;]
suddenly: Mk 9:8.†

Abbott-Smith References

Liddell-Scott-Jones

ἐξάπινα-ᾰ [ᾰπ],

later form of ἐξαπίνης, [LXX+NT+2nd c.AD+].

_{LSJ Scripture Refs: LXX.Num.4.20 ☩ Mark.9.8}