The phrase "of little brain" is often used to describe someone who is not very intelligent or lacks common sense. There are several synonyms for this term, including foolish, simple, unintelligent, dim-witted, and idiotic. Each of these terms describes a person who may not grasp complex concepts or make wise decisions. Some other synonyms for "of little brain" might include airheaded, birdbrained, or ditzy. While these terms can be used to describe individuals who are not very bright, it is important to remember that intelligence comes in many different forms, and there are many ways that individuals can contribute to society regardless of their level of formal education or cognitive ability.