When we agree provisionally, we indicate that our endorsement is conditional and still may be subjected to changes based on future events or new information. Some synonyms for agree provisionally include: tentatively, conditionally, with reservations, provisionally, temporarily, hesitantly, uncertainly, cagily, guardedly, warily, with a pinch of salt, with a grain of salt, with qualifications, and with caveats. It is essential to make these qualifications explicit in writing or in speech, so there remains no misunderstanding between the parties involved. Using these synonyms while conversing or writing may express the same level of caution while being clearer and more concise.