Probatively is an adverb that means to demonstrate or establish the truth or existence of something. There are a variety of synonyms that can be used to convey similar meanings, including evidentially, demonstratively, convincingly, conclusively, validatingly, justifiably, substantively, and verifyingly. These words can all be used to convey the idea of confirming or proving the truth or validity of something. Each synonym adds its own nuance to the meaning of the word, giving writers a range of options to choose from when seeking to convey a specific message or tone in their writing.