The word "un-trustworthiness" refers to someone or something that cannot be relied upon or trusted. Synonymous words for "un-trustworthiness" include deceitful, unfaithful, treacherous, unreliable, false, dishonest, unscrupulous, disreputable, undependable, and questionable. These words describe individuals or situations that cannot be entirely trusted, whether due to their past behaviors or their lack of integrity. Untrustworthy people may make false promises, deceive others, or behave in ways that are harmful or undermine their trustworthiness. In contrast, trustworthy individuals are honest, reliable, and consistent in their words and actions, inspiring confidence and respect from others.