- Is "lunatic cat" like "crazy cat" or "it's nonsense, they don't say so", or something else?
- According to https://en.oxforddictionaries.com/definition/lunatic there is a connection to the moon (see "origin"). Could native speaker imagine "lunatic cat" as "moon cat"?
There is only one modern adjectival meaning of 'lunatic' and it is:
- "silly in a dangerous way", or "wildly foolish"
There is an old meaning of "mentally ill", but the term would never be used of someone actually mentally ill today. 'crazy' would be a good synonym.
So a 'lunatic cat' would be a cat that behaved dangerously, or 'wildly foolishly'.
The etymology does derive from 'lunar' for the moon, but the modern meanings do not relate to the moon. The adjective for 'of or pertaining to the moon' would be 'lunar'.