1. The quality or state of being hard, unyielding, or unfeeling; emotional coldness or severity.
Usage: Often used to describe a person's character or demeanor
2. The physical quality of being hard or resembling flint; brittleness or stoniness.
Usage: Less common; primarily technical or descriptive

Examples

• The judge's flintiness was evident in her unwavering sentences.
• His flintiness made it difficult for others to approach him with personal problems.
• She spoke with such flintiness that no one dared to question her decision.
• The flintiness of his gaze suggested he would not be swayed by emotion.
• Despite her flintiness, she was respected for her fairness and consistency.
• The rock's flintiness made it useful for starting fires.
• His flintiness of character was both a strength and a weakness in leadership.