fiendish C1 Topic:Describing Qualities US /ˈfiːndɪʃ/ See IPA manual Freq #31188 Meanings 1 adj Extremely cruel or evil. The villain came up with a fiendish plan to poison the whole town's water supply. 2 adj Extremely difficult or clever. The puzzle was so fiendish that no one could solve it for weeks. Thesaurus Synonyms 1 adj · extremely cruel or evil. infernalconniving Word family Derived forms fiendishlyfiendishness Etymology AI details From fiend + -ish. Topics Describing Qualities Word Formation & Derivatives External links Google Images Cambridge Dictionary Wiktionary # fiendish **Type:** Word **Level:** C1 **Part of speech:** adj **IPA (US):** /ˈfiːndɪʃ/ **Frequency rank:** 31188 ## Meanings 1. Extremely cruel or evil. 2. Extremely difficult or clever. ## Examples - The villain came up with a fiendish plan to poison the whole town's water supply. - The puzzle was so fiendish that no one could solve it for weeks. ## Derived Forms - fiendishly - fiendishness ## Etymology From fiend + -ish. ## AI Etymology Fiendish is from fiend + -ish. In present-day use, it can mean extremely cruel or evil, or extremely difficult or clever. Derived formations include fiendishly and fiendishness. ## Topics - Describing Qualities - Word Formation & Derivatives markdown