gibber
verb (used without object)
to speak inarticulately or meaninglessly.
Used to describe an ongoing action or continuous state that will be taking place in the future.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Monsieur will be gibbering in his bed unless he sleeps soon.
From Helmet of Navarre by Bertha Runkle