"Ghastful" is not a commonly used word, and it's not found in most dictionaries. However, some people use it to describe something that's frightful or terrifying. The spelling of this word is based on the root word "ghast," which means ghostly or spectral. The -ful suffix means full of or characterized by. Therefore, "ghastful" means full of or characterized by ghastliness. The phonetic transcription of "Ghastful" is /ɡæstfʊl/.