Dissident republican (True Republican)
One who is not going to sell-out
to the pro British GFA.

From STEM, an abbreviation short for "Science, Technology, Engineering and Mathematics", a STEMlord is a pejorative term for a particular kind of person who has studied in these areas at university or works in these fields who holds a pretentious, condescending attitude to anyone who has studied in any other fields, particularly the Arts and Humanities. They typically believe themselves to be more "intelligent" and "rational", while generally remaining incredibly ignorant outside of their areas of expertise and having the charisma of a rotting pig's backside.

someone who often disagrees with you but who has your best interests at heart. Always rejects violence so cannot be called a terrorist or an anarchist. Generally dies young or never leaves the house (see house arrest).
Syntactically - dissident (which is a noun) has no associated verb stem. You cannot 'dissid'. You can do nothing dissidently - there is no associated adjective. In fact the word exists alone as an island in a sea of semantics. Perhaps this is why the meaning of the word has persisted unchanged for such a long time.