The antonyms for the word "un-punctual" include "punctual", "precise", "prompt", "timely", "regular", "scheduled", "exact", "consistent", "reliable", and "on time". These words denote a sense of responsibility, discipline, and respect for one's commitments. Punctuality is an essential quality that helps maintain order and efficiency in any setting, be it a workplace, school, or social gathering. Being punctual not only reflects one's professionalism and credibility but also demonstrates respect for others' time and efforts. Therefore, it is important to cultivate the habit of being punctual and to strive to be consistent in honoring one's commitments.