good
eu = good
It means, literally, "in", as opposed to "out". It's not so much a prefix as a portmanteau word, combining the words in + patient.
The prefix that makes "upgrade" mean the opposite is "down-," so "downgrade" means to lower or reduce in quality or status.
The prefix mal means bad or evil.
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'Cat' (or 'cata') is a Greek prefix with several possible meanings: down, against, very, bad(ly), or completely. Example: catastrophe (literally "an overturning")
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the prefix un added to fortunate mean not lucky because fortunate means lucky so adding un makes unfortunate mean not lucky
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Cowboys loved a colorful phrase! This is another euphemism for whiskey. The image is of a liquid that makes you frisky and wanting to scamper about.
It is a euphemism for "Good God!"