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1. Unable to be placated or appeased
2. Relentless; unstoppable
1. Batman was implacable in his pursuit of justice in Gotham City.
2. Thanos proved to be an implacable foe, determined to collect all the Infinity Stones.
3. Despite Nobita's apologies, Gian remained implacable and refused to forgive him for breaking his toy.
4. Ellen Ripley from 'Aliens' faced the implacable xenomorph queen in a fierce battle for survival.