"More unspontaneous" can be described using a variety of synonyms. One such word is "contrived", which suggests that the lack of spontaneity is a result of being forced or artificial. Another synonym is "stilted", which describes behavior that is rigid and unnatural. The term "rehearsed" also fits, implying that the lack of spontaneity is due to preparing or practicing something beforehand. Similarly, "scripted" suggests a lack of improvisation, and "overly structured" describes something that is overly rigid and predetermined. Overall, these synonyms convey the sense that "more unspontaneous" refers to behavior that is inauthentic, stiff, and lacking in creativity.