fiendish
fien·dish
adjective
1.
extremely evil or cruel; expressive of cruelty or befitting hell
- “something demonic in him--something that could be cruel”
- “fires lit up a diabolic scene”
- “diabolical sorcerers under the influence of devils”
- “a fiendish despot”
- “hellish torture”
- “infernal instruments of war”
- “satanic cruelty”
- “unholy grimaces”
Origin
From fiend + -ish.
Related words
Word family
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.