GRE重點詞匯解析：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. 固執(zhí)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 傾向于默認的;compliant, flexible, pliable, pliant, yielding 易受影響的

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

　　【例】 an implacable enemy 無法與之和解的敵人

　　【近】 determined, grim, relentless, unappeasable

　　【反】 placable 可平息的，可緩和的