Apishness refers to the act of behaving in a foolish or silly manner, resembling an ape. Some synonyms for apishness include mimicry, foolishness, buffoonery, monkey business, clowning, tomfoolery, and silliness. Mimicry implies copying someone else's actions or behavior without thought. Foolishness suggests acting without good sense, judgment, or discretion. Buffoonery is the act of being a clown or a jester, behaving in a comical or absurd way. Monkey business implies unprofessional or unethical conduct. Clowning and tomfoolery describe playful, sometimes mischievous behavior. Silliness is behaving in a foolish, trivial, or senseless way. All of these words are used to describe behavior that is not serious, dignified, or appropriate.