Untrustworthy persons can be described using various synonyms that reflect the different types of negative behaviors that they exhibit. Some of the synonyms include unreliable people who cannot be relied on to keep their word, dishonest individuals who lack integrity and often engage in lies and deceitful activities, deceptive persons who use trickery and manipulation to get what they want, and unscrupulous people who have no moral compass and engage in unethical activities. Other synonyms include disloyal individuals who betray trust and exploit relationships for personal gain, treacherous persons who are capable of inflicting harm and betrayal, and deceitful people who often break promises and are not accountable for their actions. These synonyms help to paint a clear picture of the behavior characteristics that define untrustworthy individuals.