No profession

From Guild Wars Wiki

When a Profession is either not chosen, or there is a profession but it is ignored to focus on a character's main profession. No profession often refers to a character (usually NPC) who has literally no profession (or no identifiable profession). This can also refer to a character who has no secondary profession and/or chooses to focus on their primary profession. Monks generally fall under the latter category as their demand for healing and protection outweigh any other demand for skills of a secondary profession.