implacable
Impossible to appease
Implacable describes someone or something that cannot be appeased or pacified.
An implacable enemy will not be satisfied by concessions or apologies.
An implacable force continues relentlessly: the implacable march of time, implacable opposition to the proposal.
The word suggests a hardness that no softening can reach.
Continuing without pause
- unrelentingRefusing to let up
- persistentContinuing despite difficulty
- unstoppableImpossible to halt
- incessantNever pausing or stopping
unabating · tireless · indefatigable · persevering · unflagging · ceaseless · unceasing · inexorable
Refusing to give way
- unbendingRefusing to change position
- inflexibleUnable to bend
- uncompromisingRefusing to yield ground
- steadfastFirmly loyal, unshakeable
resolute · firm · adamant · immovable · rigid · obstinate · intransigent · stubborn
Showing no clemency
- pitilessLacking any compassion
- ruthlessLacking any compassion
- unforgivingShowing no leniency
- cruelWillfully causing suffering
heartless · remorseless · unsparing · harsh · cold-blooded · unmerciful · callous · brutal
relentless
Continuing without pause
- unrelentingRefusing to let up
- persistentContinuing despite difficulty
- unstoppableImpossible to halt
incessant · unabating · tireless · indefatigable · persevering · unflagging · ceaseless · unceasing · inexorable · insistent
unyielding
Refusing to give way
- unbendingRefusing to change position
- inflexibleUnable to bend
- uncompromisingRefusing to yield ground
steadfast · resolute · firm · adamant · immovable · rigid · obstinate · intransigent · stubborn · unshakeable
merciless
Showing no clemency
- pitilessLacking any compassion
- ruthlessLacking any compassion
- unforgivingShowing no leniency
cruel · heartless · remorseless · unsparing · harsh · cold-blooded · unmerciful · callous · brutal · stern