1. Hoaho Kagoha Jutsu: Hoaho Kagoha Jutsu is an easily mastered ninjutsu technique used by the Uchiha clan. However, it lacks utility and has never been shown to kill anyone in the anime, which is disappointing.

2. Amaterasu: Amaterasu is a powerful dojutsu technique activated by Sasuke and Itachi's Mangekyou Sharingan. It generates unstoppable black flames. However, despite its power, Amaterasu has never resulted in a kill.

It can be countered using Tailed Beast Chakra or cutting off limbs, making it less effective.

3. Rishiogo Sealing Jutsu: Rishiogo Sealing Jutsu is a forbidden technique used by Danzo before his death. It was intended to take down Sasuke and Tobi, but unfortunately, Danzo committed suicide and failed to kill anyone. This jutsu proved to be ineffective, showcasing Danzo's weakness.

4. Shimagoto Zanshujutsu: Shimagoto Zanshujutsu is a technique used by the Third Hokage and Kakashi during an examination.

It involves burying the opponent underground, leaving only their head exposed to pretend decapitation. However, this technique is dangerous as it provides an easy opportunity for actual decapitation. It has proven to be ineffective.

5. Shikigami Kiss: Shikigami Kiss is a ninjutsu technique utilized by the grave robber Deidara. It allows the user to absorb the chakra of the person they kiss. However, when Deidara attempted to kiss Naruto, he enjoyed it too much, resulting in Deidara absorbing the chakra of Naruto's Shadow Clone instead. Therefore, this technique has limited usefulness.