"Pestful" is a word in ENGLISH

pestful ENGLISH
Definition:

Pestiferous.

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boraginaceous ENGLISH

Of, pertaining to, or resembling, a family of plants (Boraginaceae) which includes the borage, heliotrope, beggar's lice, and many pestiferous …

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pestiferous ENGLISH

Noxious to peace, to morals, or to society; vicious; hurtful; destructive; as, a pestiferous demagogue.

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pestiferous ENGLISH

Pest-bearing; pestilential; noxious to health; malignant; infectious; contagious; as, pestiferous bodies.

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pestiferously ENGLISH

In a pestiferuos manner.

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