When looking for synonyms for "hardbitten," words like tough, callous, and hardened come to mind. "Hardened" implies a person who has become emotionally and mentally desensitized through difficult experiences. "Callous" suggests a person who is insensitive or indifferent to others' feelings. "Tough" denotes a person who is strong and resilient in the face of adversity. Other synonyms for "hardbitten" include "cynical," which refers to a person who is distrustful of human nature, and "jaded," which means a person who is bored and unenthusiastic about life. These words evoke a similar sense of resilience, strength, and perhaps an unwillingness to show vulnerability.