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imperious
imperishable
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implacable

im·plac·a·ble [ im plákəb'l ]


adjective 
Definition:
 
impossible to appease: impossible to pacify or to reduce in strength or force
an implacable foe
an implacable ice storm

[15th century. < Latin implacabilis< placabilis "easily appeased" < placare "to calm"]

im·plac·a·bil·i·ty [ im plàkə bíllətee ] noun
im·plac·a·ble·ness [ im plákəb'lnəss ] noun
im·plac·a·bly [ im plákəblee ] adverb
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