Comment by IIsi50MHz
2 years ago
First, it's important to understand that words mean what people tend to use them to mean.
Second, "happy" and "happiness" subsume numerous meanings. You're picking one, and as I and others have, at times, done with many other words, trying to restrict the world to only that meaning.
Perhaps a more similar word to your meaning would be "joy"? It seems more generally restricted to descriptions of brief periods, in common usage.
If I were simply restricting the meaning, then the examples I am offering would mean you could use happy or e.g. contentedness interchangeably, or at least doing so wouldn't sound ridiculous. Yet I'm sure you're realizing by now that you cannot! For another example - a stern and disciplined person, who is rather dour of character, could be completely contented, but it would be illogical to call this person "happy", however you might want to define the term.
The words are simply not synonyms, or even particularly close to being synonyms.