Most stymied refers to being highly obstructed or prevented from completing a task or achieving a goal. The antonyms for this phrase could include words such as facilitated, facilitated, enabled, or aided, which suggest that a task or goal is made easier or more achievable. Other antonyms might include clear, unobstructed, unhindered, or uncomplicated, which suggest that there are no barriers to completing a task or achieving a goal. Ultimately, the antonyms for the phrase most stymied suggest a sense of support or freedom that makes it possible to overcome obstacles and achieve success.