1. That may be decided.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• decidally,
• decibale,
• decible,
• decirable,
• devidable,
• depedable,
• decerable,
• decirnable,
• degadable,
• derirable,
• desitable,
• deisable,
• merciable,
• decaiable,
• decayeble,
• deecidable,
• decidble,
• Decidible,
• decidaute,
• deciduatee

The adjective form of the word "decidable" is "decidable".

The plural form of the word "Decidable" is "Decidables".

The singular form of the word "Decidable" is "Decidable".