1) Capable of being contested 2) Challengeable 3) Debatable 4) Disputable 5) Questionable 6) Shakable 7) Shakeable 1) Challengeable 2) Disputable 3) Questionable 4) Shakable 5) Shakeable 
• (a.) Capable of being contested; debatable.
Capable of being competed for. A contestable market is one in which there are no barriers to entry and in which exit is cost free.
Con·test'a·ble adjective [ Confer French contestable .] Capable of being contested; debatable. 
[adj] - capable of being contested
contestable 1. Capable of or that which can be contested. 2. That which may be disputed or debated; disputable; controvertible.
adjective capable of being contested