When it comes to finding synonyms for the word "heart-searching," there are a few options to choose from. For example, "introspective" is a term that can be used to describe someone who is engaged in deep reflection on their own thoughts and feelings. "Soul-searching" is another similar term that may be used to describe a period of deep contemplation or reflection on one's own life or experiences. Meanwhile, "self-examination" refers specifically to the act of examining one's own thoughts, feelings, and actions in order to gain greater self-awareness. Overall, there are many words and phrases that can be used in place of "heart-searching" depending on the context and tone of the writing.