GRE重点词汇解析：implacable

　　1) unwilling to be pacified or appeased

　　2) unable to be calmed down or made peaceful

　　Synonyms: inflexible, merciless, relentless, uncompromising, unyielding

　　Although the team had been eliminated from contention in the playoffs, it proved to be an implacable opponent.

　　The baby was so implacable a warm bottle would not settle her.

　　The two year old was an implacable child; he cried no matter what his parents did to comfort him.

　　【考法1】adj. 固执的： sticking to an opinion, purpose, or course of action in spite of reason, arguments, or 　　persuasion

　　【近】 adamant, dogged, headstrong, intransigent, mulish, obdurate, pertinacious, stubborn, unyielding

　　【反】 acquiescent 倾向于默认的;compliant, flexible, pliable, pliant, yielding 易受影响的

　　【考法2】adj. 无法平息的： not capable of being appeased, significantly changed, or mitigated

　　【例】 an implacable enemy 无法与之和解的敌人

　　【近】 determined, grim, relentless, unappeasable

　　【反】 placable 可平息的，可缓和的