in no uncertain terms

US /ɪn noʊ ʌnˈsɜrtn tɜrmz/
UK /ɪn noʊ ʌnˈsɜrtn tɜrmz/
"in no uncertain terms" picture
1.

clearly and directly, leaving no doubt

:
She told him in no uncertain terms that she would not tolerate his behavior.
The manager explained in no uncertain terms what was expected of the team.