For stackable keywords, a number is used to determine how powerful their effect is. Keywords with the number 1 are abbreviated by mentioning the respective keyword without the number. 

These keywords stack, meaning that multiple instances of the same keyword are summed up.

Example: If you give Flexible 2 to a task that is already Flexible, it becomes Flexible 3. 

The following keywords are stackable:

• Flexible X
• Hopeful X
• Reckless X
• Teamwork X