For general fluency:
* Effortlessly: This emphasizes the ease with which something is done.
* Articulately: This highlights clear and precise communication.
* Smoothly: This emphasizes the seamless flow of speech or action.
* Readily: This conveys a natural and effortless ability.
For specific types of fluency:
* Gracefully: This emphasizes elegance and poise in movement or speech.
* Confidently: This highlights a sense of certainty and self-assurance.
* Eloquently: This suggests a powerful and persuasive way of speaking.
* Glibly: This implies fluency that may be superficial or insincere.
For specific contexts:
* Proficiently: For technical skills or knowledge.
* Competently: For demonstrating a satisfactory level of skill.
* Spontaneously: For actions or speech that are unplanned and natural.
The best choice will depend on the specific situation and the meaning you want to convey.