#implacably

[jackspanto]

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[tinysciencecow]

A uniformed policeman beside him surveyed the guests implacably.

Neverwhere by Neil Gaiman

implacable:

unable to be placated. "he was an implacable enemy of Ted's" synonyms: unappeasable, unforgiving, unsparing

relentless; unstoppable. "the implacable advance of the enemy"

--Google dictionary