Underestimation (noun)

An underestimation is an error in judgement or calculation that leads to an underestimation of the actual value or outcome.

Origin:

From the prefix under- meaning less or not enough and the word estimation.

Examples:

1. The company made an underestimation of the cost of the project.
2. His underestimation of the distance he had to walk led to him being late.
3. She made an underestimation of the time it would take to finish the task.
4. The underestimation of the storm's strength led to severe damage.
5. He made an underestimation of the effort required to complete the task.