"Tough-skinned" is a term used to describe someone who is resilient and able to withstand criticism or difficult situations. Some synonyms for "tough-skinned" include: thick-skinned, hardy, durable, unyielding, and strong-willed. These words suggest a person who is able to persevere through adversity and maintain a level of mental toughness. Other related words include: stoic, unflappable, steely, and iron-willed. All of these words describe someone who is able to remain calm and focused even in the face of adversity or pressure. Whether in personal or professional situations, these qualities are often seen as essential for success.