Which of the following is NOT one of the basic principles (tenets) of Taekwondo?

The principle of humility is indeed an important aspect of martial arts and personal growth, but it is not recognized as one of the foundational tenets of Taekwondo. The basic principles that define Taekwondo are integrity, perseverance, self-control, indomitable spirit, and courtesy. Each of these tenets plays a significant role in developing a practitioner’s character both on and off the mat.

Integrity pertains to being honest and strong in one's principles. Perseverance emphasizes the importance of persistence in achieving goals, especially in the face of challenges. Self-control is crucial in martial arts as it helps practitioners manage their emotions and reactions effectively.

While humility could enhance the practice and the overall mindset of a martial artist, it is not classified as one of the official tenets within the structure of Taekwondo philosophy. Thus, identifying humility as not being part of the core tenets accurately reflects its distinction from those officially recognized principles.