Knaves are people who are dishonest or untrustworthy, and there are many synonyms to describe them. Some may call them scoundrels, deceivers, or rogues. Others may refer to them as charlatans, swindlers, or tricksters. These words all convey the idea of someone who cannot be trusted or who engages in deceitful behavior. In addition, terms such as rascals, villains, and scamps may also be used to describe knaves. It's important to choose the right word based on the context, level of severity, and intended tone of the statement. Ultimately, whether someone is a knave or not, depends on their actions and character.