Oppilative is a rarely used word which means burdensome, oppressive, or causing difficulty. However, there are many other synonyms that can be used interchangeably such as onerous, weighty, grievous, cumbersome, trying, and arduous. These words convey the idea of hardship or difficulty and can be used to describe heavy workload, challenging tasks, or daunting responsibilities. Additionally, words like oppressive, harsh, or overbearing can be used when referring to people or situations that exert excessive control or authority. In any case, there is no shortage of synonyms for the word oppilative, and choosing the right one can help to convey the intended meaning more effectively.