Definify.com

Webster 1913 Edition

Adj.

Without a hump.

Darwin.

humpless ‎(not comparable)

Without humps.
- 2008 March 17, Katherine Zoepf, “Camels Go Easily Through the Eyes of Admirers”, in New York Times:
  Another pen, apparently a kind of maternity suite, held nursing mothers; a 3-day-old, virtually humpless and the size of a golden retriever on very long legs, followed at a confident trot when its mother was led away by a buyer.