flat-out tell (someone)

Translations
сказать (кому-либо) прямо
I had to flat-out tell her that I wasn't interested.
Мне пришлось сказать ей прямо, что я не заинтересован.
Definitions
To say something to someone in a very direct, clear, and unambiguous way, often without trying to soften the message or avoid hurting their feelings.