The term thick-skinned means not easily offended or affected by criticism. There are many synonyms available for this term, such as insensitive, indifferent, unfeeling, impervious, tough, callous, and indifferent. These words describe a person who remains calm and composed even in stressful situations. Being thick-skinned is a useful trait, especially in professional workplaces where criticism and feedback are often given. However, it is important to remember that being thick-skinned should never be used as an excuse for being rude or thoughtless towards others. In conclusion, possessing the ability to stay calm and not take things personally is a valuable characteristic that can lead to success in life.