Which word means believable?

• credit
• creditor
• credible
• incredible

Which word means "unbelievable"

• incredible
• credit
• creditor
• credulous

To believe that someone will do something

• credit
• creditor
• creed
• incredible

Someone who believes that they will be paid back money they loaned 

• credit
• creditor
• creed
• incredible

believing too easily

• credit
• credulous

refuse to believe

• credit
• discredit

a set of religious beliefs or principles

• discredit
• creed