Unable to be appeased or pacified; relentlessly determined or unforgiving. Describes someone or something that cannot be calmed, satisfied, or stopped.
From Latin 'implacabilis,' from 'in-' (not) + 'placare' (to appease, calm). The root 'plac-' also appears in 'placate' and 'placid,' all relating to calmness or peace.
Think 'im-placate-able' — cannot be placated or calmed down. Like a storm that won't be appeased by any offering, or an enemy who refuses every peace treaty. Implacable forces just keep coming.
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