positively

Synonyms: amen assuredly categorically certainly doubtless doubtlessly easily emphatically firmly flat flat out for a fact indubitably no catch no holds barred no ifs ands or buts no kicker no strings attached on the money on the nose really truly right on sure surely the ticket to a tee undeniably undoubtedly unequivocally unmistakably unquestionably with certainty without qualification

Antonyms: doubtfully questionably