What is another word for most unspontaneous?
Pronunciation: [mˈə͡ʊst ʌnspɒntˈe͡ɪni͡əs] (IPA) 
When someone is described as "most unspontaneous," it means they lack the ability to be impulsive or spontaneous in their behavior. Some synonyms that can be used to describe someone who is "most unspontaneous" include rigid, inflexible, strict, methodical, and calculated. These words all suggest a lack of spontaneity and an adherence to structure and routine. Other synonyms include predictable, systematic, ordered, methodical, and deliberate. People who are described as "most unspontaneous" often have difficulty adapting to change and may struggle with creative thinking or problem-solving that requires outside-the-box thinking.
