The phrase "are deceitful" implies that someone or something is intentionally misleading or dishonest. Some synonyms for this phrase include "are dishonest," "are deceptive," "are untrustworthy," "are unreliable," "are treacherous," and "are fraudulent." When someone is deceitful, they may be trying to hide something or appear more favorable than they actually are. It's important to be aware of deceitful behavior in order to protect yourself from harm or betrayal. Ultimately, it's always best to seek out honesty and trustworthiness in our personal and professional relationships.