Braininess refers to the intellectual capacity, intelligence, or mental ability of an individual. It's a trait that is highly valued in many contexts, such as in academic or professional settings. However, there are numerous synonyms to replace the word braininess to make it more varied and interesting. Cleverness, intellect, scholarship, sagacity, astuteness, brilliance, acuity, sharpness, ingenuity, expertise, and knowledgeability are just a few of the many synonyms that can be used instead of braininess. These words describe different aspects of intelligence and mental ability, allowing us to express ourselves in more colorful and engaging ways.