UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ɪmˈplækəbəl/

US:USA pronuncation: IPAUSA pronuncation: IPA/ɪmˈplækəbəl, -ˈpleɪkə-/

US:USA pronunciation: respellingUSA pronunciation: respelling(im plakə bəl, -plākə-)

WordReference Random House Learner's Dictionary of American English © 2020
im•plac•a•ble /ɪmˈplækəbəl, -ˈpleɪkə-/USA pronunciation   adj. 
  1. impossible to placate; not to be pacified or stopped:an implacable enemy.
im•plac•a•bil•i•ty /ɪmˌplækəˈbɪlɪti, -ˌpleɪkə-/USA pronunciation  n. [uncountable]
im•plac•a•bly, adv.: The enemy advanced implacably.See -plac-.

WordReference Random House Unabridged Dictionary of American English © 2020
im•plac•a•ble  (im plakə bəl, -plākə-),USA pronunciation adj. 
  1. not to be appeased, mollified, or pacified;
    inexorable:an implacable enemy.
im•plac′a•bili•ty, im•placa•ble•ness, n. 
im•placa•bly, adv. 
  • Latin implācābilis. See im-2, placable
  • late Middle English 1375–1425
    unappeasable, unbending, merciless. See  inflexible. 

Collins Concise English Dictionary © HarperCollins Publishers::
implacable /ɪmˈplækəbəl/ adj
  1. incapable of being placated or pacified; unappeasable
  2. inflexible; intractable

imˌplacaˈbility, imˈplacableness n imˈplacably adv
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