So, the decoded message is: "myth jargon synonyms".
"thmyl" -> "myth" "brnamj" -> "jargon" "alanymws" -> " synonyms" thmyl brnamj alanymws
The message "thmyl brnamj alanymws" seems to be encoded using a Caesar cipher, where each letter has been shifted by a certain number of places in the alphabet. So, the decoded message is: "myth jargon synonyms"