You could add the prefix mis- to it to make the word misfits.
The prefix "omni-" fits this description. It comes from the Latin word "omnis" meaning all or everywhere, and is used in words like "omniscient" (all-knowing) and "omnipresent" (present everywhere).
The prefix that fits the definition of backward or back is "re-".
The prefix that fits the definition of pseudoscience is "pseudo-", which means false or not genuine.
The word "unread" fits this description, as "un-" is a prefix that means 'opposite' and "-read" is a suffix indicating that the action has already happened.
The prefix that means "backwards" is "retro-".
Marine means water or ocean or sea or the like. The prefix "sub-" means underneath or below or lower. So submarine means under water. Changing the prefix of submarine to make a word opposite in meaning would be to replace the prefix with a prefix that means higher or above or over. And "super-" is the prefix that fits the bill. The word supermarine would mean above water.
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