1. That can be thought.

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

• linkable,
• thinble,
• shickable,
• shinkable,
• rhinkable,
• fhinkable,
• ghinkable,
• yhinkable,
• 6hinkable,
• 5hinkable,
• tginkable,
• thninkable,
• thnkable,
• thinkble,
• thiknable,
• thinkabel,
• thinkible,
• thinkablenes,
• tincatble,
• tinktable

• think over,
• think back,
• think about,
• think piece.

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

The plural form of the word "thinkable" is "thinkables".

The singular form of the word "thinkable" is "thought"