The word "tieless" refers to the absence of a tie, and there are a few synonyms that can be used in its place. One option is "unadorned," which suggests a lack of embellishment or decoration. Another possibility is "untied," which emphasizes the lack of a knot or binding. "Casual" can be used to describe a tieless outfit that is dressed down or more relaxed than formal attire. Additionally, words like "unbuttoned" or "open" can convey a similar meaning, indicating a lack of formality or structure. Regardless of which synonym is chosen, the absence of a tie suggests a more laid-back and informal style.