Both Uses

coherent
in
Kiss the Girls
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The highly intelligent intern raved incoherently throughout most of the morning.†
Chpt 2 *

incoherently = not in a sensible and clear manner; or not in a manner where parts fit together consistently or pleasingly

standard prefix: The prefix "in-" in incoherently means not and reverses the meaning of coherently. This is the same pattern you see in words like invisible, incomplete, and insecure.
Her words were slightly slurred, but at least she was coherent.†
Chpt 2

coherent = sensible and clear; or describing parts as fitting together in a consistent or pleasing manner

Definitions:

(1) (coherent)
sensible and clear; or describing parts as fitting together in a consistent or pleasing manner
(2) (meaning too rare to warrant focus)
A comprehensive dictionary will have more specialized definitions of coherent such as one used in physics.