1. the quality or state of acting or moving with excessive speed; hurrying without due care or thought
Usage: uncountable; often implies carelessness or lack of deliberation
2. quickness to anger; irritability or impatience
Usage: uncountable; describes a tendency toward quick temper

Examples

• The hastiness of his decision led to serious regrets later.
• She spoke with hastiness, not taking time to consider her words.
• His hastiness in judgment often caused misunderstandings with colleagues.
• The project failed due to the team's hastiness in planning.
• He apologized for his hastiness and promised to listen more carefully.
• Hastiness is rarely a virtue in matters requiring careful thought.
• Her hastiness to anger made it difficult for others to work with her.