What is the opposite adverb of jerkily?

The opposite adverb of jerkily depends on the specific meaning you want to convey:

For movement:

* Smoothly

* Effortlessly

* Gracefully

* Fluidly

For action:

* Gently

* Carefully

* Deliberately

* Methodically

For speech:

* Clearly

* Fluently

* Articulately

* Smoothly

The best opposite will depend on the context of your sentence.