"Fiend" is a word in ENGLISH

fiend ENGLISH
Definition:

An implacable or malicious foe; one who is diabolically
wicked or cruel; an infernal being; -- applied specifically to the
devil or a demon.

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bitterness ENGLISH

The quality or state of being bitter, sharp, or acrid, in either a literal or figurative sense; implacableness; resentfulness; severity; …

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deadly ENGLISH

Aiming or willing to destroy; implacable; desperately hostile; flagitious; as, deadly enemies.

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deadly ENGLISH

In an implacable manner; destructively.

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implacability ENGLISH

The quality or state of being implacable.

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implacable ENGLISH

Not placable; not to be appeased; incapable of being pacified; inexorable; as, an implacable prince.

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implacable ENGLISH

Incapable of ebign relieved or assuaged; inextinguishable.

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The quality of being implacable; implacability.

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implacably ENGLISH

In an implacable manner.

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incensement ENGLISH

Fury; rage; heat; exasperation; as, implacable incensement.

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inexpiable ENGLISH

Incapable of being mollified or appeased; relentless; implacable.

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Not reconcilable; implacable; incompatible; inconsistent; disagreeing; as, irreconcilable enemies, statements.

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rancorous ENGLISH

Full of rancor; evincing, or caused by, rancor; deeply malignant; implacably spiteful or malicious; intensely virulent.

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