As every English learner, I come across many near-synonyms and synonyms, such as 'sad,' 'gloomy,' and 'wretched'. How can I determine which of them conveys a stronger emotional intensity? What words are moderate in use for formal meetings, and which ones are too strong? What words sound more literary and what words are typical of everyday speech? Is there a dictionary, thesaurus, or another resource I can consult to assist me in this endeavour?
The only thing I've met is two labels in Collins dictionary for words: informal / formal and approval /disapproval.