Translation of "Unintentionally" in Spanish

But it occurred to me that, unintentionally,

Me di cuenta de que, sin que fuera mi intención,

He unintentionally revived his mother-in-law.

Sin querer, revivió a su suegra.

A gentleman is one who never hurts anyone's feelings unintentionally.

Un caballero es alguien que nunca hiere los sentimientos de otra persona involuntariamente.

And it was unintentionally, totally, I hadn't thought about it at all.

Y fue sin querer, totalmente, yo no lo había pensado para nada.

Tom is the least sensitive person Mary knows. Every time she talks with him, he hurts her feelings, unintentionally, and without noticing.

Tom es la persona menos sensible que María conoce. Cada vez que ella habla con él, él hiere sus sentimientos sin querer y sin darse cuenta.