IPA: /sɪˈdeɪtnəs/
KK: /sɪˈdeɪtnəs/
The quality of being calm and peaceful, without excitement or disturbance.
Her sedateness during the stressful situation impressed everyone around her.
Sedateness → It is formed from "sedate" (from Latin "sedatus", meaning calm or quiet) and "-ness" (meaning the state or quality of). The word "sedateness" refers to the quality of being calm or tranquil.
Think of the word 'sedate' which means calm, and remember that 'sedateness' describes the state of being calm.