Lexical Definition

‎εὐχάριστος‎ eucháristos (yoo-khar'-is-tos) thankful ^G:A
from ‎εὖ‎ and a derivative of ‎χαρίζομαι‎

thankful.

• well favored, i.e. (by implication) grateful

Abbott-Smith

εὐχάριστος, -ον (< εὖ, χαρίζομαι), [in LXX for חֵן, Pr 11:16 * ;]
1. = εὔχαρις, winning, gracious, agreeable (Pr, l.c.).
2. grateful, thankful: Col 3:15.†

Abbott-Smith References

Liddell-Scott-Jones

εὐχάριστος-ος, ον,

agreeable, τινι τέχνη [Refs 5th c.BC+]; λόγοι [Refs]; - ότατα καὶ πιθανώτατα εἴρηκε [Refs 2nd c.BC+]; εὐχάριστα acceptable gifts, [Refs 5th c.AD+]. adverb -τως, τελευτᾶν τὸν βίον to die happily, [Refs 5th c.BC+]

__II grateful, thankful, [NT+5th c.BC+] adverb -τως, διακεῖσθαι πρός τινα [Refs 1st c.BC+]
__III beneficent, θεοί [Refs 2nd c.BC+]; title of Ptolemy V, [Refs]; τὸ τῆς ψυχῆς εὐ. [Refs 1st c.BC+]; βεβαιωτὴς (-ότης codices) εὐχάριστος, of God, [Refs 1st c.AD+]

_{LSJ Scripture Refs: Col.3.15}