1. too valuable or great to be measured or calculated

Examples

• The mentor’s guidance was of inestimable value to the young scientist.
• Her grandmother’s recipes are an inestimable treasure to the family.
• The museum’s collection includes artifacts of inestimable historical importance.
• Clean water is an inestimable resource that many take for granted.
• The teacher’s patience had an inestimable impact on her struggling students.
• Ancient manuscripts provide inestimable insight into past civilizations.