The spelling of the word "most rattleboned" can be a bit tricky, but with some help from phonetic transcription, it becomes clearer. In IPA, the pronunciation of the word is /moʊst ˈrætlˌboʊnd/. The first syllable is pronounced like "most," but the second syllable has four sounds: "rat," "uhl," "bone," and "d." The stress is on the second syllable. Overall, "most rattleboned" means extremely weak or feeble and is often used to describe someone who is in poor health or lacking strength.