Euphemos means 'of good reputation' or 'well spoken of' — things or persons spoken of with praise and approval. The word gives us the English 'euphemism,' though the NT meaning is straightforwardly positive: those things that have genuine good repute, that are rightly praised and honored. It appears in Philippians 4:8 in Paul's famous catalogue of virtues for meditation.
Philippians 4:8 is a masterpiece of virtue ethics: 'whatever is true, noble, right, pure, lovely, admirable [euphemos] — if anything is excellent or praiseworthy — think about such things.' Euphemos describes the things that have earned genuine praise — not PR-managed reputation but authentic honor. The command to meditate on such things is a cognitive strategy for spiritual formation: what we dwell on shapes what we become. The mind filled with things of genuine repute will itself become a mind of genuine honor. This is NT wisdom aligned with Old Testament meditation on Torah.