"sedater" in the adjective sense
1. sedate, staid
characterized by dignity and propriety
2. grave, sedate, sober, solemn
dignified and somber in manner or character and committed to keeping promises
"a grave God-fearing man"
"a quiet sedate nature"
"as sober as a judge"
"a solemn promise"
"the judge was solemn as he pronounced sentence"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License