Ballsier is a slang word used to refer to someone who is courageous or bold. Antonyms for ballsier would be words that convey the opposite meaning, such as timid, hesitant, or cautious. These words describe someone who is not bold, adventurous, or willing to take risks. Other antonyms for ballsier include cowardly, fearful, and spineless. Such terms are typically used to criticize someone for lacking the courage or bravery needed to face difficult situations or challenges. As such, these antonyms paint a contrast to the high-energy, bold, and daring nature represented by the word "ballsier.