Sedateness is a related term of grimness.
As nouns the difference between sedateness and grimness
is that sedateness is the state or quality of being sedate; calmness of mind, manner, or countenance; composure; placidity; serenity; tranquillity while grimness is the characteristic or quality of being grim.
sedateness
English
Noun
(-)
The state or quality of being sedate; calmness of mind, manner, or countenance; composure; placidity; serenity; tranquillity.
References
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grimness
English
Noun
(-)
The characteristic or quality of being grim