The word "untrustiness" implies a lack of reliability or trustworthiness. Its antonyms, therefore, include words that signify dependability, honesty, and faithfulness. Some of the possible antonyms for the word "untrustiness" include reliability, trustworthiness, dependability, loyalty, faithfulness, sincerity, candidness, honesty, and integrity. Using these words instead of "untrustiness" can help convey a positive and trustworthy image. Such antonyms can be useful in many contexts, such as in personal relationships, business dealings, or legal matters. By using the right antonyms, we can communicate our trustworthiness and dependability to others, thereby enhancing our image and reputation in society.