Pronunciation: [fˈiːndɪʃli] (IPA) 
Fiendishly is spelled with the letter "ie" in the middle, followed by "d" and then "ish". This is because the sound of the vowel is a long "e" or /iː/ and the sound of the ending is "ish" or /ɪʃ/. The "f" and "n" sounds are pronounced as expected. The word means something that is diabolically difficult or wicked, and the spelling can be a bit of a challenge for those unfamiliar with its structure.
Fiendishly is an adverb that conveys the idea of something being excessively or extremely wicked, cruel, or vexatious. It is often used to describe actions, behaviors, or situations that are deceitful, malevolent, or characterized by a diabolical nature. This adverb emphasizes the sinister and malicious aspects of a person, their actions, or even an inanimate object, implying a sense of evil or devilishness.
The term can also be employed to denote an action or behavior that is extremely difficult, convoluted, complex, or challenging to resolve. Its use in this context highlights the formidable or challenging nature of a task, complicating the process by adding an element of deviousness or intricacy.
For example, one might say that a criminal devised a fiendishly elaborate plan to rob a bank, illustrating the cunning and intricacy of their scheme. Additionally, a particularly challenging puzzle or problem may be described as fiendishly difficult, emphasizing the extent to which it perplexes and causes difficulty for those trying to solve it.
Overall, "fiendishly" encapsulates the idea of wickedness, cruelty, complexity, or difficulty, acting as a powerful adverb that intensifies the negative or challenging qualities of an action, behavior, or situation.
* The statistics data for these misspellings percentages are collected from over 15,411,110 spell check sessions on www.spellchecker.net from Jan 2010 - Jun 2012.
The word "fiendishly" is derived from the noun "fiend", which originated in Old English as "fēond". In Old English, "fēond" referred to an enemy or adversary. It can be traced back to the Proto-Germanic word "*fijandz", meaning "hating". Over time, "fiend" came to represent an evil or wicked person, or even a supernatural being. The adverb "fiendishly" is formed by adding the suffix "-ly" to "fiend", indicating action or manner. In this context, "fiendishly" means behaving or acting like a fiend, indicating extreme wickedness or malice.
