Thomas was educated at the village-school of Kellieston, and subsequently at the academy of Dumfries. The circumstances of his parents required that he should choose a manual profession; and he was apprenticed by his own desire to a neighbouring mill-wright. It was during his intervals of leisure, while acquiring a knowledge of this laborious occupation, that he first essayed the composition of verses; he submitted his poems to his father, who mingled judicious criticism with words of encouragement. "The Har'st Home," one of his earliest pieces of merit, was privileged with insertion in the series of "Poetry, Original and Selected," published by Brash & Reid, booksellers in Glasgow. Proceeding to England in 1797, he entered the workshop of a mill-wright in Rotherham. Under the same employer he afterwards pursued his craft at King's Lynn; in 1800 he removed to Wiltshire, and soon after to the neighbourhood of Cambridge. He next received employment at Dover, and thence proceeded to London, where he occupied a situation in the establishment of Rennie, the celebrated engineer. He afterwards became foreman to one Dickson, an engineer, and superintendent of Fowler's chain-cable manufactory. In 1812 he returned to Rennie's establishment as a clerk, with a liberal salary. On leaving his father's house to seek his fortune in the south, he had been strongly counselled by Mr Miller of Dalswinton to abjure the gratification of his poetical tendencies, and he seems to have resolved on the faithful observance of this injunction. For a period of nine years his muse was silent; at length, in 1806, he appeared in the _Scots Magazine_ as the contributor of some of the best verses which had ever adorned the pages of that periodical. The editor was eloquent in his commendations; and the Ettrick Shepherd, who was already a contributor to the magazine, took pains to discover the author, and addressed him a lengthened poetical epistle, expressive of his admiration. A private intimacy ensued between the two rising poets; and when the Shepherd, in 1809, planned the "Forest Minstrel," he made application to his ingenious friend for contributions. Cunningham sanctioned the republication of such of his lyrics as had appeared in the _Scots Magazine_, and these proved the best ornaments of the work.