Antonyms for the phrase "stands fast" can include words such as waver, yield, give in, surrender, falter, vacillate or waiver. Opposite in meaning, these antonyms suggest a lack of determination, steadfastness, or resoluteness. Instead of standing fast, one might waver in their beliefs, falter in their commitment, or surrender to outside pressures. These antonyms reflect the opposite mindset and actions of standing firm, suggesting a lack of confidence, conviction, and strength of character. In contrast, those who stand fast embody a sense of unwavering commitment, steadfastness, and unflinching determination in the face of adversity.