Dictionary entry

ἀγρυπνέω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

ἀγρυπνέω, -ῶ

(< ἄγρυπνος, seeking sleep; < ἀγρεύω, ὕπνος),

[in LXX chiefly for שׁקד;]

to be sleepless, wakeful (Theogn., Xen., al.); metaph. (LXX) = cl. ἐγρήγορα, to be watchful, vigilant: Mk 13:33, Lk 21:36, Eph 6:18, He 13:17.†

SYN.: γρηγορέω, q.v.; νήφω, associated with γ. in I Pe 5:8, expressing a wariness which results from self-control, a condition of moral, not merely mental alertness (v. M, Th., I, 5:6).