Arguable (adjective)

1. Capable of being argued or debated; open to question.
2. Able to be proved or disproved by argument.

Origin:

Late 16th century: from french arguable or latin arguabilis, from arguare "prove".

Examples:

1. It is arguable whether the law is fair or not.
2. The point was arguable, but not proven.
3. The statement is arguable, but not necessarily true.
4. It is arguable whether the decision was right or wrong.
5. The theory is arguable, but not yet proven.