Cách sử dụng
The word 'fiendish' is used to describe something that is extremely wicked, cruel, or evil. It can also be used to describe something that is very difficult or complicated to understand or solve. For example, you might use the word 'fiendish' to describe a difficult puzzle or a complicated math problem. You might also use it to describe the actions of a villain or an evil character in a story. Overall, the word 'fiendish' is used to describe things that are really bad or really hard to deal with.