terriblement, affreusement
I imagine the other fellow must be dreadfully injured.
J’imagine que l’autre homme doit être grièvement blessé.
— The Personal History of David Copperfield (2019)
Dreadfully distinct.
Terriblement distinct.
— Blade Runner 2049 (2017)
Dreadfully.
Horriblement.
I love you most dreadfully.
Je t’aime terriblement.
— Rebecca (1940)