The word thick-skinned means someone who is insensitive or indifferent to criticism or other people's opinions. Antonyms for this word include sensitive, thin-skinned, and touchy. Someone who is thin-skinned is easily upset or offended by criticism, while someone who is touchy is hypersensitive to others' opinions and reactions. Other antonyms include empathetic, caring, and compassionate, words which describe people who are highly attuned to the feelings and emotions of others. While being thick-skinned can be an asset in some situations, it is important to balance this trait with kindness and empathy to maintain healthy relationships with others.