"Roby" is a slang term used to describe someone who is unscrupulous or dishonest in their behavior. If you are looking for synonyms for "roby," you might consider terms such as "deceitful," "duplicitous," "untrustworthy," "treacherous," or "dishonest." Other words that may be used to describe someone who behaves in a "roby" manner include "sneaky," "sly," "crafty," "tricky," or "clever." These words all suggest a sense of the person being slippery or evasive, rather than forthright and honest. If you encounter someone behaving in a "roby" manner, it is important to be cautious and aware of their motives and actions.