Since I am neither a genius nor stealthy, I think I would be a big failure.
Debussey said "genius theif", which means being a brutal extraordinary superbish thief.
Since being a thief = mostly a trained skill (as long as have the necessary prerequisites, like being cold as ice), the "genius thief" = a result of you becoming a brutal expert at every aspect of burglary including painstakingingly detailed strategic planning, mastery of stealth, technical knowledge about stuff like alarm systems, knowledge about police routines, knowledge about laundering and hiding your aquired financial assets (via LLC's, offshore accounts ect) and so on.
Deicide, the master thief: