The word "brattish" is often used to describe a child who is behaving badly or spoiled. However, there are several other synonyms that can be used interchangeably to describe such behavior. One example is "spoiled," which indicates a child who is accustomed to getting what they want and may throw tantrums when denied. Another synonym is "entitled," which refers to a child who expects special treatment and privileges. "Discourteous" and "ill-mannered" are also synonyms for "brattish," indicating a lack of respect and consideration for others. Regardless of the word used, it is important to address and correct such behavior to ensure children grow up to be respectful individuals.