• Webster's Revised Unabridged Dictionary
    • n Rouncy A common hackney horse; a nag. "he rode upon a rouncy as he could."
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Century Dictionary and Cyclopedia
    • n rouncy A common hackney-horse; a nag.
    • n rouncy A vulgar, coarse woman.
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Chambers's Twentieth Century Dictionary
    • n Rouncy rown′si (obs.) a common hackney: a nag: a vulgar woman.
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In literature:

He rood up-on a rouncy, as he couthe, In a gowne of falding to the knee.
"King's Cutters and Smugglers 1700-1855" by E. Keble Chatterton
In Coltman, Runciman, it is occupative, the man in charge of the colts, rouncies or nags.
"The Romance of Names" by Ernest Weekley
The next morning before Mr. Foker drove off in his drag, the insinuating major had actually got a letter of Miss Rouncy's in his own pocket-book.
"A History of Pendennis, Volume 1" by William Makepeace Thackeray