Affirm with confidence can be said in many other ways to convey the same message. Similar phrases include "assert unequivocally," "declare with certainty," "pronounce with conviction," "affirm with assurance," and "state with firmness." These synonyms emphasize the speaker's unwavering belief in the truth of their statement. Other alternatives include "reiterate with confidence," "reaffirm with sincerity," "confirm with conviction," "proclaim with conviction," and "testify with conviction." Regardless of the wording chosen, the sentiment remains the same - the speaker is confident and unwavering in their declaration. These phrases can elevate one's speech and communicate confidence to the audience.