1. the quality of being loyal, committed, and steadfast in support or belief
2. the quality of being strong, substantial, and reliable

Examples

• Her staunchness as a friend never wavered, even during difficult times.
• The staunchness of his political beliefs impressed both supporters and critics.
• We admired the staunchness of the old bridge that had withstood decades of storms.
• The team’s staunchness in defending their position led to victory.
• His staunchness in supporting local businesses helped the community thrive.
• The staunchness of the castle walls protected the inhabitants for centuries.