Unto/ˈʌntə/ Definition 1 of 3Pro Tip 1/3Reacting Kindly Use 'unto' when emphasizing kindness or fairness in response to others' actions. What you want others to do unto you, do likewise unto them. Pro Tip 2/3Archaic Tone 'Unto' adds a formal or old-fashioned tone to your speech, as if quoting old texts. She will render unto her peers the respect they have given her. Pro Tip 3/3Rarely Used It's uncommon in modern conversation, but you may find 'unto' in literature or quotes. He handed the letter unto the messenger.