winless

From win + -less.

winless (not comparable)

1. Having never won; without a win; unsuccessful.
   • 2010 December 28, Kevin Darlin, “West Brom 1 - 3 Blackburn”, in BBC‎^[1]:

     Rovers arrived in the Black Country in a certain amount of turmoil with Kean winless in his first two matches, including a home defeat to Stoke on Boxing Day,

• undefeated