Asseverative is a word that means making a strong and solemn declaration or assertion. Some synonyms for asseverative include affirmatory, positive, declarative, assertive, dogmatic, and categorical. Using affirmatory emphasizes the speaker's confidence in their statement. Positive indicates a definitive belief in what is being declared. Declarative highlights the act of making a statement outright. Assertive and dogmatic both emphasize the speaker's belief in their declaration. Categorical emphasizes the total confidence the speaker has in their assertion. All these synonyms for asseverative indicate a strong belief and declaration of a statement.