c. 1500, "pleasing, agreeable" (a sense now obsolete), from Old French placable "forgiving, conciliatory" and directly from Latin placabilis "easily appeased or pacified," from placare "to calm, appease, quiet, soothe, assuage," causative of placere "to please" (see please). From 1580s as "capable of being pleased or pacified, easily appeased, willing to forgive." Related: Placably; placability.
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