Lexical Definition

‎νυστάζω‎ nystázō (noos-tad'-zo) to doze ^G:V
from a presumed derivative of ‎νεύω‎

slumber.

• to nod, i.e. (by implication) to fall asleep
• figuratively, to delay

Abbott-Smith

νυστάζω (cf. νεύω), [in LXX for נוּם, etc;]
to nod in sleep, fall asleep: Mt 25:5. Metaph., of negligence or delay, ἡ ἀπώλεια αὐτῶν οὐ νυστάζει (cf. Ps 120 (121):4*, Is 5:27): II Pe 2:3.†

Abbott-Smith References

Liddell-Scott-Jones

νυστάζω-άζω,

future -άξω [LXX]: aorist ἐνύσταξα [LXX+4th c.BC+]:— mostly present, to be half asleep, doze, νυστάζωάζοντα οὐδένα ἂν ἴδοις [νυστάζωάζοντες ἐγειρόμενοι 5th-6th c.BC: Plato Philosophus “Apologia” 31a; ὀφθαλμοὶ πλέοντες ὥσπερ τῶν νυστάζωαζόντων 5th c.BC: Hippocrates Medicus “ἐπιδημίαι” 7.17 ">Refs 5th c.BC+]; οὐχὶ νυστάζωάζειν ἔτι ὥρα ’στίν [νυστάζωάζοντος δικαστοῦ 5th-6th c.BC: Plato Philosophus “Respublica” 405c: \_metaphorically\_, ν. τε καὶ ἀπορεῖ [prev. author] “Ion” 533a; τὸν νυστάζωάζοντα καὶ ἀμαθῆ φύσει [prev. author] “Lg.” 747b ">Refs 5th c.BC+]; ἔν τινι in a thing, [Refs 1st c.AD+]

__2 hang the head, ἐδάκρυσεν καὶ ἐνύστασε [Refs].with (Cf. Lithuanian snústi (stem snúd-) 'grow drowsy'.)

_{LSJ Scripture Refs: LXX.Isa.5.27 ☩ LXX.2Kgs.4.6}