There are many synonyms for the term "internal monologue" that can be used in writing and speaking. These include "inner dialogue," "internal dialogue," "stream of consciousness," and "introspection." These terms all refer to the thoughts and reflections that occur within a person's mind, often without being externally expressed. Some other related terms include "self-talk," "inner voice," and "mental chatter." The term "soliloquy" is also sometimes used to refer to an extended internal monologue within a literary work or dramatic performance. Overall, these synonyms offer a variety of options for discussing the complex internal workings of the human mind.