FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

euthumeo εὐθυμέω — yoo-thoo-meh'-o — from 2115; to cheer up, i.e. (intransitively) be cheerful; neuter comparative (adverbially) more cheerfully:--be of good cheer (merry).

see GREEK for 2115