Unequivocal
/ˌʌnɪˈkwɪvəkəl/ adjective mediumCompletely clear and leaving no room for doubt or more than one interpretation.
The CEO's unequivocal denial ended all speculation about the merger.
Memory Trick
Break down 'un-' (not) and 'equivocal' (open to more than one meaning, from roots for 'equal' and 'call') -- an unequivocal statement can only be called one way.