fortitude

This term describes a quiet, enduring strength rather than an impulsive or aggressive act of bravery. It suggests a long-term capacity to withstand pain or adversity without complaining, often associated with moral character and psychological resilience. As an uncountable noun, it does not have a plural form and cannot be counted with numbers. To quantify it, one must use partitive phrases such as a great deal of fortitude or a measure of fortitude.