Discouraged = "We think this is a bad thing." Strongly discouraged = "We think this is a very bad thing." Deprecated = "We think this is a bad thing, see no reason to continue using it, and wish it would go away, but it won't so we have to leave it in the standard/spec/table/system/format/programming language etc."
In particular something may be discouraged, even strongly, from the very beginning of it being used in some standard/spec etc. (where a need to use it is foreseen as well as the problems it may cause).
