Translation of "Handedly" in Spanish

To approach Q&A sessions more even-handedly,

de plantear las entrevistas de manera más imparcial,

I feel like it was pretty much single-handedly ushered in

Creo que quien marcó el inicio

And it single-handedly killed his business in less than a month.

y esto, por sí solo, se cargó su negocio en menos de un mes.