I would hate to try to lift the dictionary that had a specific word for every shade of human emotion. Think of all the words that relate to happy but don't mean quite the same thing: glad, content, gay, joyful, pleased, ...
And then we would argue about half of them and never use the other half in speech.
Fortunately the flexibility (instability?) of English allows us to make portmanteau words and phrases as well as use metaphor and all the other poetic devices. I could speak of "awestruck-relief" or "the peaceful excitement of watching the moon rise" and whether or not you liked my writing style you would have a sense of what I mean.
Besides the very creation of specific words would simply limit expression in another direction.
Great topic for discussion Marianna.