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 (ĭm-plăk′ə-bəl, -plā′kə-)
Impossible to placate or appease: implacable foes; implacable suspicion.

[Middle English, from Old French, from Latin implācābilis : in-, not; see in-1 + plācābilis, placable; see placable.]

im·plac′a·bil′i·ty n.
im·plac′a·bly adv.
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References in classic literature ?
She said, with a grim implacability in voice and manner which made Tom almost realize that even a former slave can remember for ten minutes insults and injuries returned for compliments and flatteries received, and can also enjoy taking revenge for them when the opportunity offers:
After a few minutes' reflection, however, she continued, "I DO remember his boasting one day, at Netherfield, of the implacability of his resentments, of his having an unforgiving temper.
Newman gave a short laugh, but the old man seemed for the moment not to perceive it; he was gazing away, absently, at some metaphysical image of his implacability.
Bush correctly gauged the implacability of our enemies, and their hostility to the West and democratic governance.
Such is the political implacability on this issue that even the keystone incident of aACAyBraveheart' in December 2012 in Delhi, which created an unprecedented public outrage in India, could not make a dent in it.
When I look at this picture I think, Boldness, Implacability, Disgruntlement, a lack of interest in Guile.
This is suicide as a cry against implacability, as big history sweeps down upon the little man.
These lucky finds--things and persons apparently passing before a kind of camera trap that freezes them in their natural habitat--only seem to grow in significance when set against against the implacability of the wall face, a surface whose material history and psychic weather Fletcher knows intimately.
As he wrote recently, the widening gap between incomes and living costs is a result of "state monopolism, corruption and inefficient administration, [itself] a consequence of the implacability of power.
It is no news to anyone - apart from possibly the BBC, which inexplicably left him out of a recent featurette on its website about long-term sporting dominance - that Tony McCoy is homing in on the 4,000-winner milestone, hunting it down with that nonchalant implacability we've come to know and love and be awed by.
The mythopoetic language here resonates as Santiago's admiration for the fish collides with the implacability of his fisherman's code.
74) Muhammad, being given the pleroma of the divine virtues, manifested Divine Justice as well; if the Prophet was to survive the first years of his preaching, a self-giving and pacifistic life was not in his purview, for only implacability against the attacks of his persecutors and the surrounding tribes would allow him to succeed.