Translation of "Unwise" in Spanish

This is unwise.

Esto es insensato.

She ignored him, which proved unwise.

Ella lo ignoró, lo que resultó ser imprudente.

I felt that the plan was unwise.

Me di cuenta de que el plan no era sensato.

It would be unwise, not to say stupid, of you to quit your first job after only six months.

Ni que decir tiene que dejar el primer empleo después de apenas seis meses es una estupidez.