Sinceramente (en. Honestly)

/sin.θe.ɾa.ˈmen.te/

Slang Meanings

Colloquial usage that implies a direct expression.
I'm telling you sincerely, it seems crazy to me.
Te lo digo sinceramente, me parece una locura.
Sometimes used in a sarcastic manner.
Sincerely, who does he think he is?
Sinceramente, ¿quién se cree?