Dictionary of synonyms

Synonyms and antonyms of the word: fiendishly

Synonyms:

Synonyms that are in the dictionary are marked in green. Synonyms that are not in the dictionary are marked in red.

Antonyms:

Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.

Usage examples:

That serves to show how World Cups are fiendishly difficult to win, even with the best lead-ins.

Source: https://www.theroar.com.au/2023/07/24/the-wrap-a-dozen-reasons-why-the-wallabies-cant-win-the-world-cup-and-a-couple-why-they-might/