Some prefixes are; equivalent, metonym. Source-http://thesaurus.reference.com/browse/synonyms
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Dismantle means to take apart.It is an antonym for verbs such as to build or to assemble. It was formed using the prefix dis- (undo) and the French word manteler (to cover, to cloak).It is, however, a synonym for the verb disassemble.
A synonym for varied is diverse.
A synonym for temper is temperament.
"Im" is a common prefix in itself, you don't add a prefix to a prefix.
I don't think there is a synonym for adjoined it is an antonym.