Pea brained is an insulting term used to describe someone who is stupid or unintelligent. There are many synonyms for this term, including dim-witted, dull, ignorant, foolish, and simple-minded. Other words that can be used to describe someone who is pea brained include slow-witted, dumb, thick, and dense. These words all convey a similar meaning to pea brained but may be perceived as less offensive. It's important to note that using insulting language, regardless of the term used, can be hurtful and is not a constructive way to communicate. It's better to avoid negative language and focus on building up others with positive reinforcement.