underestimation

This is due to the enemy’s underestimation of China and also to his shortage of troops.

Her underestimation of her opponent's skills cost her the match.

The team's underestimation of the competition led to their defeat.

The underestimation of the project's complexity caused delays in the timeline.

His underestimation of the task's difficulty resulted in poor performance.

Underestimation of the market demand led to overproduction of the product.

The underestimation of the storm's severity caused damage to the crops.

She learned the hard way that underestimation of one's abilities can be detrimental.