The term 'challenging person' can be described by two crossword solutions: ICONOCLAST (10 letters) and darer (5 letters). An ICONOCLAST is someone who challenges traditional beliefs, social norms, and established institutions. They are often seen as rebels or revolutionaries who challenge the status quo. A darer is someone who takes risks and is willing to challenge themselves and others. They are often seen as brave and courageous individuals who are not afraid to take risks.