Attestive is a word used to describe a statement or action that confirms or verifies something. Synonyms for this include affirming, validating, verifying, confirming, and endorsing. Other similar words include corroborating, supporting, backing, vouching, and ratifying. These words all describe actions or statements that give credibility to something. They indicate the genuineness and legitimacy of something, which can be crucial in a court of law or in business dealings. Attestive statements are an important part of any legal or business proceedings, and having a strong vocabulary of synonyms for this word can help to convey credibility and professionalism in all situations.