Adair was admitted to Peterhouse, Cambridge, and took a B.A. in 1764, and M.A. in 1767.[1] He was educated in law and a due course called to the bar by the society of Lincoln's Inn. In the early part of the reign of George III he was ranked among the advocates of the popular side; in 1771, he was employed as counsel in the famous case of the House of Commons against the printers of Letters of Junius, and in this and other instances gave so much satisfaction to the citizens, that, on the death of John Glynn, he was elected Recorder of London,[2] a post he held until 1789.[3]
His manner as a speaker was somewhat coarse, but it was impressive. He had great copiousness and fluency of delivery, and his powers of reasoning were of the highest order.