arguable

adjective2

1. •
   That can be argued; that can be proven or strongly supported with sound logical deduction, precedent, and evidence.
2. •
   Open to doubt, argument or debate.

   • This led to a set of rules (play cannot begin before crossing East Blithedale Avenue), then subrules ("crossing" means reaching the always arguable halfway point of the avenue) [… — 2009