Excogitating is a term that is usually associated with deep thinking and pondering. Some of the synonyms for this word include contemplating, reflecting, meditating, cogitating, and deliberating. Other similar terms include ruminating, brooding, mulling over, and pondering. These words all denote a process of carefully considering and analyzing a subject or idea. They may be used in different contexts to describe various levels of insight, but they all imply a thoughtful and intentional process of introspection. If you are looking for a word to express the act of deliberating or reflecting deeply on a matter, any of these synonyms can be the perfect choice.