Implacable means being incapable of being appeased or pacified, unyielding and inflexible. It refers to someone who is stubborn, obstinate, and immovable, showing no mercy or compassion towards others.
Usage examples
The implacable enemy launched a series of relentless attacks on our troops.
Despite numerous attempts at negotiation, the two nations remained implacable in their opposition to compromise.
She harbored an implacable hatred for her ex-husband, refusing to even speak to him.
The grieving father was implacable in his quest for justice, vowing to do whatever it took to bring his son's killer to court.
The storm's fury was unleashed with an implacable force, causing widespread destruction in its path.
I'm pretty sure this stuff won't appear in the promotional materials CTA distributes to charter school teachers, but I'm confident they're informed enough to know that the union has been the most implacable foe of charter schools in California for more than 20 years. (californiapolicycenter.org)
However, the tribunal should be alert to the possibilities of implacable hostility and parental alienation at play. (newlawjournal.co.uk)
Writes Managing Editor Trisha Ping: «This new novel stands out from King's oeuvre because a villain is not immediately apparent... the adversary in 11/22/63 is perhaps King's most implacable force yet: history itself.» (bookpage.com)