Sucker/ˈsʌkər/ Definition 1 of 4Pro Tip 1/3Easily Tricked Use to describe someone who trusts too quickly and is deceived. He's such a sucker for get-rich-quick schemes. Pro Tip 2/3Informal Usage A casual word, often used among friends or in relaxed environments. I can't believe I was a sucker and gave him the money. Pro Tip 3/3Negative Connotation Carries a negative judgment, could offend if not used carefully. Don't be a sucker and fall for his lies again.