The word "illtimed" refers to an event or action that occurs at a time when it is not appropriate or suitable. The opposite of illtimed could be well-timed, which means an event or action that happens at the right time or is suitable for a particular occasion. Other antonyms for illtimed include timely, punctual, appropriate, opportune, and well-judged. A well-timed action or decision can be the difference between success and failure, as it demonstrates good judgment and foresight. Being punctual and timely in fulfilling a commitment or obligation can also help build trust and credibility, which is important in personal and professional relationships.