bungler (noun)

1. The bungler in charge of the construction project caused multiple costly mistakes, resulting in an unstable building.

2. In the novel, the protagonist's neighbor is portrayed as a bungler who constantly ruins his own plans and gets into comical mishaps.

3. During the construction of the Great Wall of China, there were cases where a bungler incorrectly placed bricks or weakened certain sections, compromising its strength.

4. In the magical realm, the bungler wizard's attempts to cast spells often yield disastrous results, causing chaos and confusion amongst the inhabitants.