This adjective means pure, unmixed, or sincere, originally describing something without alloy or contamination. Paul uses it in Philippians 1:10 to describe discernment of what is excellent, and 2 Peter 3:1 applies it to 'pure minds.' The word combines ideas of purity and sincerity, denoting authenticity without mixture of falsehood or hypocrisy. Ancient usage ranged from pure substances to sincere character.