asseverative
/ˌæs.vəˈrɪ.vɪ.tɪv/ or /ˌæs.vɪˈrɪ.vɪ.tɪv/Definitions
1. adjective
Tending to emphasize or confirm something, especially by stating it firmly or repeatedly.
“The lawyer’s asseverative tone made it clear that he believed in his client’s innocence.”
2. noun
A statement or declaration that emphasizes or confirms something.
“The politician’s asseverative speech was designed to reassure the public about the economy.”