Here are some options, depending on the specific context:
To express the unexpected success despite initial negativity:
* Triumph: This implies a victory over adversity.
* Overcome: This highlights the act of conquering a challenge.
* Surpass: This emphasizes exceeding expectations.
* Defy: This suggests success against the odds.
* Rise above: This implies overcoming negative circumstances.
To emphasize the combination of frowning and succeeding:
* Grit: This describes determination and perseverance in the face of difficulty.
* Resilience: This suggests the ability to bounce back from setbacks.
* Tenacity: This emphasizes unwavering commitment to achieving a goal.
* Resolve: This highlights the strength of purpose and commitment.
To describe a specific situation:
* Grim determination: This suggests a focused effort despite negativity.
* Smiling through gritted teeth: This paints a picture of inner struggle masked by external success.
* A hard-won victory: This highlights the effort and challenges faced.
Ultimately, the best word will depend on the specific situation and the nuance you want to convey.