IPA: /sɪˈdeɪtə/
KK: /sɪˈdeɪtər/
More calm and quiet than something else; less active or excited.
The atmosphere in the library is much sedater than in the bustling café.
Comparative: more sedate
Superlative: most sedate
Sedater → It is formed from "sedate" (from Latin "sedare", meaning to calm or settle) and "-er" (meaning a person who). The word "sedater" refers to a person who calms or settles others, often used in a medical or therapeutic context.
Think of someone who helps to 'calm' ('sedare') others — that's what a sedater does.