Strong's Concordance

Original word: εὐθυμέω
Transliteration: euthumeó
Definition (short): courage
Definition (full): to be of good cheer

NAS Exhaustive Concordance

Word Origin: from euthumos
Definition: to be of good cheer
NASB Translation: cheerful (1), keep up...courage (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From euthumos; to cheer up, i.e. (intransitively) be cheerful; neuter comparative (adverbially) more cheerfully -- be of good cheer (merry).

see GREEK euthumos

KJV: And now I exhort you to be of good cheer: for there shall be no loss of any man's life among you, but of the ship.
NASB: "Yet now I urge you to keep up your courage, for there will be no loss of life among you, but only of the ship.
KJV: Wherefore, sirs, be of good cheer: for I believe God, that it shall be even as it was told me.
NASB: "Therefore, keep up your courage, men, for I believe God that it will turn out exactly as I have been told.
KJV: Is any among you afflicted? let him pray. Is any merry? let him sing psalms.
NASB: Is anyone among you suffering? Then he must pray. Is anyone cheerful? He is to sing praises.