Grunebaum, in his book Classical Islam said that an approximate translation is "passerby" or "nomad".

Classical Islam: A History 600 A.D. - 1258 A.D..

Classical Islam and the Naqshbandi Sufi Order, ISBN 978-1-930409-10-1 (2004)

Calder et al. (2003) Classical Islam: A Sourcebook.

Classical Islam: A sourcebook of Religious Literature.

It is stated in Classical Islam and the Naqshbandi Sufi Tradition, by Shaykh Hisham Kabbani that:

Classical Islam often equates the sunnah with the hadith.

Classical Islam: A History 600 A.D.-1258 A.D..

Classical Islam: A History, 600 A.D. to 1258 A.D. Aldine Transaction.

Classical Islam: A Sourcebook of Religious Literature.