Lexical Definition

‎εὐθυμέω‎ euthyméō (yoo-thoo-meh'-o) be cheerful G:V
from ‎εὔθυμος‎

be of good cheer (merry).

Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
εὐθυμεῖτε take courage Acts.27.25
εὐθυμεῖν to keep up your courage Acts.27.22
εὐθυμεῖ Is cheerful Jas.5.13

Abbott-Smith

** εὐθυμέω, -ῶ (< ὔθυμος), [in Sm.: Ps 31 (32):11*, Pr 15:15 * ;]
1. trans., to make cheerful (Æsch.).
2. Intrans. (Eur., Plut.; so mid. in Xen., Plat.), to be of good cheer: Ac 27:22, 25, Ja 5:13.†

Abbott-Smith References

Book Refs
Psalms 32:11*
Proverbs 15:15
Acts 27:22 · 27:25
James 5:13

Liddell-Scott-Jones

εὐθυμέω-έω,

to be of good cheer, [NT+5th c.BC+]: feminine dative plural present participle εὐθυμεύσαις [Refs 3rd c.BC+]; περὶ τῆς κριθῆς εὐθύμει do not be anxious about.., [Refs 2nd c.AD+]

__II transitive, cheer, delight, τινα [Refs 4th c.BC+]:—passive, to be cheerful, [Refs 5th c.BC+]

LSJ Scripture Refs: Jas.5.13