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Definition of Fiendish
1. Adjective. Extremely evil or cruel; expressive of cruelty or befitting hell. "Unholy grimaces"
Exact synonyms: Demonic, Diabolic, Diabolical, Hellish, Infernal, Satanic, Unholy
Similar to: Evil
Derivative terms: Demon, Devil, Unholiness
Similar to: Evil
Derivative terms: Demon, Devil, Unholiness
Definition of Fiendish
1. a. Like a fiend; diabolically wicked or cruel; infernal; malignant; devilish; hellish.
Definition of Fiendish
1. Adjective. Sinister; evil; conniving; in the manner of a fiend. ¹
¹ Source: wiktionary.com
Definition of Fiendish
1. extremely wicked or cruel [adj]