Không thể nghi ngờ được, không thể tranh cãi được, không thể bác bỏ được

adjective

absolute , accurate , authentic , bona fide * , certain , clear , cold , conclusive , dependable , down pat , downright , established , faultless , flat * , flawless , for certain , genuine , incontestable , incontrovertible , indisputable , indubitable , irrefutable , manifest , no ifs ands or buts , obvious , pat , patent , perfect , positive , real , reliable , self-evident , superior , sure , sure-enough , true , undeniable , undisputable , undoubted , unequivocal , unimpeachable , unmistakable , veritable , well-founded , well-grounded , hard , inarguable , unassailable , clear-cut , definite , distinct , pronounced , actual , bona fide , good , original , decided , evident , implicit

adjective

doubtful , indefinite , questionable , uncertain , unsure