1. the quality of being impossible to appease, satisfy, or change; relentless determination or hostility
Usage: formal

Examples

• The implacability of her anger surprised even her closest friends.
• He faced the storm with the implacability of someone who had nothing left to lose.
• The judge’s implacability in sentencing was well known throughout the district.
• Her implacability in pursuing justice made her both feared and respected.
• The implacability of time means that some opportunities will never return.
• His implacability toward his former business partner destroyed their friendship.
• The implacability of natural laws cannot be negotiated or bargained with.