STERNLY ?STERNLY?
STERNLY?stern?ly
ˈstərnlē/
adverb
in a serious and severe manner, especially when asserting authority or exercising discipline.
"he sternly warned me to not do anything stupid"
in a way that is difficult and puts extreme pressure on someone or something.
"a fight had ensued, which sternly tested my peace-making skills"