flatly
adverbUK /ˈflæt.li/
US /ˈflæt.li/
In a way that is clear and firm, with no doubt.
She flatly refused to go to bed early.
OTHER MEANINGS
2. In a dull or lifeless way, without energy or emotion.
He answered flatly, as if he did not care.
3. In a level or even way, without slope.
The land stretched flatly toward the horizon.
4. In a complete or absolute manner.
The idea was flatly impossible.