In terms of language:
* Hesitant: struggling to speak smoothly and confidently.
* Halting: speaking in a broken or interrupted way.
* Awkward: lacking grace and ease in communication.
* Stuttering: repeating sounds or syllables.
* Stammering: having difficulty speaking smoothly and clearly.
* Unintelligible: difficult to understand.
* Unpolished: lacking refinement and fluency in speech.
In terms of movement or action:
* Clumsy: lacking coordination and grace.
* Awkward: lacking smoothness and naturalness.
* Stiff: lacking flexibility and ease.
* Laborious: requiring effort and difficulty.
* Uncoordinated: lacking coordination and control.
* Rough: lacking smoothness and precision.
In terms of writing:
* Choppy: lacking smooth flow and rhythm.
* Unpolished: lacking refinement and clarity.
* Awkward: lacking naturalness and grace.
* Confusing: difficult to understand.
* Rambling: lacking focus and coherence.
It's important to consider the specific context of "fluent" to choose the most appropriate opposite.