Not contracted to play for a particular sports team(adjective)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "undrafted" in a sentence
"Ryan calls undrafted free agent linebacker Nick Bellore the biggest surprise on defense thus far ."
"Ryan called undrafted free agent linebacker Nick Bellore the biggest surprise on defense thus far. ..."
"A dollar in the primary free agent market simply cannot come close to the value of a dollar in the draft or in what I'll call the "dented cans bin" (aka undrafted free agents, waiver wire pickups, AFL / CFL signings)."