If you claim that someone's actions lacked rectitude, how do you think the person most likely behaved?

"Rectitude" refers to a quality of being righteous and morally correct in behaviour or thinking; therefore, believing that someone's actions lacked rectitude would indicate that you believe they did something that was morally wrong or dishonest.

answer; i believe the above statement is (true);

entering that problem on the tube you may come up with an answer