Irrational Beliefs

noun an idea or belief that is foolish or lacking in good sense

• The idea that money can buy happiness is a fool notion that has been debunked by numerous studies.
• Thinking that skipping class won't affect your grades is a fool notion, trust me.
• Believing that you can eat junk food all day and still stay healthy is a fool notion, dude.
• The belief that you can achieve success without hard work is a fool notion that will only lead to disappointment.

noun a person who has a tendency to dream or fantasize

• The wishful thinker believed that his dreams would come true without any effort.
• Don't be such a wishful thinker, you need to be more realistic about your goals.
• She's just a wishful thinker, always hoping for things that are unlikely to happen.
• Being a wishful thinker can sometimes lead to disappointment when reality doesn't match your dreams.