Lexical Definition

‎εὖ‎ eû (yoo) well/well done! ^G:ADV
neuter of a primary (good)

good, well (done).

• (adverbially) well

Abbott-Smith

εὖ-γε adv.
in replies, well! good! well done!: Lk 19:17 (WH for Rec. εὖ, q.v.).†

εὖ adv. (prop. neuter of old Epic ἐΰς, good, noble) [in LXX, εὖ γίγνεσθαι, εὖ ποιεῖν (יָטַב) ;]
well: εὖ γιν., Eph 6:3 (LXX); εὖ ποιεῖν, c. dat. (cf. Si 12:1-2), to do good, Mk 14:7 (where Nestle suggests εὐποιεῖν, q.v.); εὖ πράσστειν, to fare well, Ac 15:29; in replies (= εὖγε), good! well done! Mt 25:21, 23 Lk 19:17 (εὖγε, WH, txt.).†

Abbott-Smith References

Liddell-Scott-Jones

εὖ,

Epic dialect also ἐΰ [Refs 8th c.BC+] adverb (properly neuter of ἐΰς):—well, opposed to κακῶς (as in [Refs 8th c.BC+]

__I of knowledge or action, well, thoroughly, competently, εὖ μέν τις δόρυ θηξάσθω, εὖ δ᾽ ἀσπίδα θέσθω [εὖ καὶ ἐπισταμένως κέασαν ξύλα 8th c.BC: Odyssea Homerus Epicus “Odyssey” 20.161; τὴν πόλιν κοσμέων καλῶς τε καὶ εὖ 5th c.BC: Herodotus Historicus 1.59; τὸ πρᾶγμα βασανίσας καλῶς τε καὶ εὖ 5th-6th c.BC: Plato Philosophus “Euthydemus” 307b, etc.">Refs 8th c.BC+]; τόξων ἐῢ εἰδώς cunning with the bow, [εὖ τόδ᾽ ἴσθι 4th-5th c.BC: Aeschylus Tragicus “Persae” 173 (troch.); εὖ γὰρ σαφῶς τόδ᾽ ἴστε [prev. work] 784 ">Refs 8th c.BC+]; εὖ οἶδ᾽ ὅτι parenthetic in colloquial speech, σὺ γὰρ εὖ οἶδ᾽ ὅτι οὐ πράγματ᾽ ᾄσει [Refs 5th c.BC+]; εὖ οἶδα, in answers, Dioxipp.4; εὖ μήδεο consider well, [Refs 8th c.BC+]; εὖ λέγεις well spoken ! [εὖ Ἐρατοσθένης 1st c.BC-1st c.AD: Strabo Geographus 1.3.1. ">Refs 5th c.BC+]
__I.2 morally well, kindly, εὖ ἔρδειν, ={εὐεργετεῖν}, [Refs 8th c.BC+]; εὖ εἰπεῖν τινα to speak well of him, [εὖ δρᾶν εὖ παθών 5th c.BC: Sophocles Tragicus “Philoctetes” 672, etc. ">Refs 8th c.BC+]
__I.3 with passive or intransitive Verbs, fortunately, happily, in good case, εὖ ζώουσι [Refs 8th c.BC+]; εὖ οἴκαδ᾽ ἱκέσθαι safely, [εὖ ἥκειν 5th c.BC: Herodotus Historicus 1.30 ">Refs 8th c.BC+]; εὖ φρονῶν in one's right mind, [εὖ φρονεῖν εἴς τινας, τὰ σά">Refs 4th c.BC+], to be well-disposed towards, [Refs 5th c.BC+]; standing last for emphasis, ἄνδρες γεγονότες εὖ [εὖ [prev. author] 3.82; τελευτήσει τὸν βίον εὖ [prev. author] 1.32, compare 5th c.BC: Thucydides Historicus 1.71, 4th c.BC: Aristoteles Philosophus “Ethica Nicomachea” 1124b13, etc.">Refs 5th c.BC+]: separated from its Verb, εὖ πρᾶγμα συντεθέν [Refs 4th c.BC+]
__II coupled with other Adverbs, especially when qualifying nouns, adjectives, and adverbs, εὖ μάλα [εὖ μάλα κοίλη 4th c.BC: Aristoteles Philosophus “Historia Animalium” 514b22; εὖ μάλα πᾶσαι “hymnus ad Apollinem” 171; εὖ μάλα πολλά 1st c.AD(?): Heraclitus 35; εὖ μάλα πρεσβύτης 5th-6th c.BC: Plato Philosophus “Euthyphro” 4a; μάλα εὖ καὶ κομψῶς [prev. author] “Sph.” 236d; εὖ καὶ μάλα [prev. author] “Smp.” 194a (sed compare “CQ” 15.4); κάρτα εὖ 5th c.BC: Herodotus Historicus 3.150 ">Refs 8th c.BC+]; εὖ.. πάνυ or πάνυ εὖ, [εὖ σφόδρα 4th c.BC: Nicostratus Philosophus 8, 4th-3rd c.BC: Philemo Comicus 75.4 ">Refs 5th c.BC+]; εὖ κἀνδρικῶς, εὖ κἀνδρείως, [Refs 5th c.BC+]; καλῶστεκαὶ εὖ[εὖ τε καὶ καλῶς 5th-6th c.BC: Plato Philosophus “Respublica” 503d. ">Refs 5th c.BC+]
__III as substantive, τὸ εὖ the right, the good cause, τὸ δ᾽ εὖ νικάτω [εὖ μετ᾽ ἐμοῦ 5th-6th c.BC: Aristophanes Comicus “Acharnenses” 661; the “Good”, final cause, τὸ εὖ τεκταινόμενος ἐν πᾶσιν τοῖς γιγνομένοις 5th-6th c.BC: Plato Philosophus “Timaeus” 68e; τοῦ εὖ ἕνεκα 4th c.BC: Aristoteles Philosophus “de Sensu” 437a1, compare [same work] “Metaphorical” 1092b26 ">Refs 5th c.BC+]: in Art, perfection, the ideal, τὸ εὖ διὰ πολλῶν ἀριθμῶν γίνεται [Refs 5th c.BC+]
__IV as the Predicate of a proposition, τί τῶνδ᾽ ε; [Refs 4th c.BC+]; εὖ εἴη may it be well, [Refs]; εὐορκεῦντι μέμ μοι εὖ εἶμεν or εἴη, [Refs 3rd c.BC+]; εὖ σοι γένοιτο well be with thee, [Refs 5th c.BC+]
__V Interjection, well done! to cheer on dogs, εὖ κύνες [Refs 5th c.BC+]; ahoy! ho! [Refs]; compare εὖγε.
__VI in Compds., implying abundance (εὐανδρία), prosperity (εὐδαίμων, opposed to κακοδαίμων), ease (εὔβατος, opposed to δύσβατος): compounded only with Nouns and adjectives (hence εὖ πάσχω, εὖ ποιέω are better written divisim, but εὐποιητικός implies εὐποιέω: see at {ἀντευποιέω}); εὐδοκέω is exceptional. (Replaced by καλῶς in later Gr., except in set phrases.)