IPA: /ˈfɪr.fəl.ɪst/
KK: /ˈfɪrflɪst/
The most afraid or scared; feeling or showing extreme fear.
In the face of danger, he was the fearfullest of them all, trembling at every sound.
Comparative: more fearful
Superlative: fearfullest
Fearfullest → It is formed from "fear" (from Old English "fǣr", meaning a feeling of anxiety or dread) and "-full" (meaning full of) and "-est" (a superlative suffix indicating the highest degree). The word "fearfullest" means the most full of fear or the greatest degree of fearfulness.
Think of 'fear' as a strong feeling of anxiety, and when you add '-full' it means full of that feeling, and '-est' indicates the highest level. So, 'fearfullest' describes someone or something that is the most full of fear.
No commonly confused words.