What is the antonmy for diction?

There isn't a perfect, single-word antonym for "diction." However, depending on the context, you might use these:

* Jargon: If "diction" refers to the specific vocabulary of a profession or group, then "jargon" could be an antonym.

* Slurring: If "diction" means speaking clearly and distinctly, then "slurring" would be the opposite.

* Mumbling: Similar to slurring, mumbling is another opposite to clear and precise diction.

* Rambling: If "diction" means speaking concisely and to the point, then "rambling" is the opposite.

* Vagueness: If "diction" means using precise and specific language, then "vagueness" would be an antonym.

Ultimately, the best "antonym" depends on the specific meaning you want to convey.