Tempestive is an uncommon word, originating from the Latin word "tempestivus", which means timely or seasonable. While alternatives for tempestive may be limited, there are several words that capture the essence of timeliness or proper timing. Words such as punctual, timely, prompt, immediate, opportune, and well-timed can be used as synonyms for tempestive. These words convey the meaning of being on time or happening at the right moment. Whether it's an appointment, event, or action, using any of these synonyms conveys a sense of efficiency, reliability, and suitability with regards to timing.