trueness

(noun) conformity to reality or actuality. Synonyms: truth, the true, verity. Examples: "They debated the truth of the proposition." "The situation brought home to us the blunt truth of the military threat." "He was famous for the truth of his portraits." "He turned to religion in his search for eternal verities."

(noun) the quality of being loyal. Synonyms: loyalty.

(noun) exactness of adjustment. Example: "I marveled at the trueness of his aim."