Easton's Bible Dictionary (1897)
The emotion of instant displeasure on account of something evil that presents itself to our view. In itself it is an original susceptibility of our nature, just as love is, and is not necessarily sinful. It may, however, become sinful when causeless, or excessive, or protracted (Matt. 5:22; Eph. 4:26; Col. 3:8). As ascribed to God, it merely denotes his displeasure with sin and with sinners (Ps. 7:11).
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
AN'GER, a strong emotion, which is sinful or otherwise according to its object and motive. When ascribed to holy beings it is used figuratively to denote high displeasure at sin. " Ps 7:11. Unjustified anger is reckoned among chief sins, and as such is severely rebuked. Eph 4:31; Col 3:8, and numerous passages in Proverbs.