IPA: //ˈɡæstli//
KK: /ˈɡæstli/
The most horrible or frightening; extremely unpleasant or shocking.
The movie was filled with the ghastliest scenes that made everyone scream.
Comparative: ghastlier
Superlative: ghastliest
Ghastliest → It is formed from "ghast" (from Old English "gast", meaning spirit or ghost) and the suffix "-liest" (meaning most). The word "ghastliest" means most ghostly or terrifying, evoking a sense of horror or dread.
Think of the word 'ghost' ('ghast') to remember that 'ghastliest' describes something that is the most terrifying or ghostly.
No commonly confused words.