The spelling of the word "most declivous" can be tricky to decipher. The IPA phonetic transcription for this word is /moʊst dɪˈklaɪvəs/. The word "most" is pronounced as /moʊst/ and the word "declivous" is pronounced as /dɪˈklaɪvəs/. "Declivous" means sloped or inclined, and is typically used in geological or topographical contexts. Despite its complex spelling, "most declivous" is a useful term for describing steep slopes or angles.
The word "declivous" itself is a relatively rare and obsolete term that is derived from Latin. Its Latin root is "declivis", which translates to "sloping downward" or "inclined". The suffix "-ous" is added to form an adjective, meaning "characterized by" or "full of". Therefore, "declivous" describes something that is sloping downwards or inclined.
As for the phrase "most declivous", it is formed by combining the superlative form of "most" with the adjective "declivous". The term "most" intensifies the meaning of the word that follows it, indicating the extreme or highest degree of declivity.