I often see the terms old-fashioned, outdated, dated, archaic, obsolete and aged in different dictionaries. Are they all synonyms and do they all mean the same thing?
Many forums discuss this and some say that obsolete is less older than archaic, and that old-fashioned and aged are synonyms, and that outdated and dated are synonyms and are less older than archaic but older than obsolete. I'm confused with so much information giving no concise explanation.
For instance the verb "ail" in [Oxford Dictionary] it is archaic, the [Merriam-Webster's Dictionary] says nothing, in [Cambridge Dictionary] it is old-fashioned, the [TheFreeDictionary] simply says that it is a literary word, in [Collins Dictionary] it is old-fashioned, [Vocabulary] says nothing, [YourDictionary] says it's now chiefly used in interrogative or indefinite constructions.
An interesting thing is that based on what Oxford says "old-fashioned" are divided into two categories "archaic" and "dated".