Implacable/ɪmˈplækəbl/ Definition 1 of 2Pro Tip 1/3Unappeasable Anger Used when someone cannot be calmed or pacified, usually due to deep anger or hurt. The judge's decision left the victims' families implacable. Pro Tip 2/3Not For Bargaining Indicates that no offering or argument will change a person's negative stance or mood. Despite the concessions, the workers remained implacable. Pro Tip 3/3No Signs of Softening Suggests that time or circumstances do not reduce the intensity of someone's resentment. Her implacable stance on the issue lasted for years.