"Smack-dab" is a colloquial term used to describe a spot or location that is exactly in the middle or center of something. Synonyms to this word would include expressions such as "dead center," "right in the middle," or "precisely located." These terms all evoke the same idea of accurate placement within a particular area. Other synonyms for "smack-dab" could include "directly in the middle," "in the heart of," "front and center," and "right in the thick of things." The use of any of these phrases would convey the same sense of exactitude and precision regarding an object's position.