IPA: /ˈvaɪlɪst/
KK: /vaɪlɪst/
The most unpleasant or morally bad; extremely offensive or disgusting.
His actions were the vilest I had ever witnessed.
Comparative: viler
Superlative: vilest
Vilest → It is formed from "vile" (from Latin "vilis", meaning cheap or lowly) and the superlative suffix "-est" (meaning most). The word "vilest" means the most despicable or morally reprehensible.
Think of something that is 'cheap' or 'lowly' ('vile') and remember that 'vilest' describes the most extreme form of that negativity.