There are a variety of synonyms for the phrase "pondered over." Some possible options include: contemplated, reflected on, dwelt upon, considered, mused, meditated, ruminated, deliberated, thought deeply, and chewed over. Each of these phrases conveys a similar idea of focused, introspective thought, but with slightly different connotations. For example, "contemplated" implies a more deliberate and intentional consideration, while "mused" suggests a more casual or free-flowing thought process. Ultimately, the choice of synonym will depend on the specific context and desired tone of the writing or conversation.