implacable
/ɪmˈplækəbl/adjective
1- unable to be placated难平息的, 不能缓和的, 不饶恕的, 不宽容的：
he was an implacable enemy of Ted's.
他是泰德的死敌。
1.1
- relentless; unstoppable无情的; 不可阻挡的：
the implacable advance of the enemy.
敌人势不可挡的前进。
派生词
implacability
nounimplacably
adverb词源
late Middle English: from Latin implacabilis, from in- 'not' + placabilis （see PLACABLE）.