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a man simply placate all around of him
Miserable is an adjective, and placate is a verb, so they are not antonyms.
To placate is to calm, pacify, or mollify.
Example : "The airline gave out free drinks in an effort to placate angry travelers."
Example : "In between, I placate her with more cake."
(Sarah Miller in Miss Spitfire: Reaching Helen Keller.)
Your Children Placate You from Premature Graves was created in 2006.
If the answer is directed at the Book of Mormon, the answer is "no." The word "placate" does not appear in this book of scripture.