Related Clues:

• Attest
• State absolutely
• Not just surmise
• Speak positively
• Declare decisively
• Orate with assurance
• Affirm decidedly
• Claim to be true
• Affirm positively
• Declare with conviction
• Assert as accurate
• Assert with confidence
• Affirm solemnly
• Declare solemnly
• Declare definitively