royalement

Il vit royalement.

He lives like a king.

Elle l'ignore royalement.

She ignores him completely.

Non seulement l'Algérie est un pays qui ne respecte pas les droits de l'homme mais s'en fiche royalement.

Algeria is not only a country that doesn't respect human rights but doesn't care at all.

Je me suis royalement planté à son sujet.

I was dead wrong about him.