If you describe someone’s actions as ~, you mean that they are determined to continue with something even if it becomes difficult or dangerous.
They have gained respect through sheer ~ determination.
= resolute, persistent
ADJ: ADJ n
~ly
She would fight ~ly for her rights as the children’s mother.
ADV: usu ADV with v
~ness
Most of my accomplishments came as the result of sheer ~ness.
N-UNCOUNT