The correct spelling of the word "most tremorous" can be explained through its phonetic transcription in IPA. The word is pronounced as /məʊstˈtremərəs/ and is spelled with the suffix -orous, which means "having a quality of, full of, or resembling something." The base of the word is tremor, meaning shaking or quivering. The prefix "most" indicates that this word describes the most or greatest degree of trembling. Overall, it describes something that is highly characterized by shaking or trembling.