All 3 Uses

coherent
in
Misery, by Stephen King
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But when Shinny came in ....Geoffrey had been sitting by Ian, who was remembering in a broken, scarcely coherent way how he and Ian had rescued Misery from the palace dungeons of the mad French viscount Leroux, how they had escaped in a wagonload of hay, and how Misery distracted one of the viscounts guards at a critics moment by slipping one gorgeously unclad leg out of the hay and waving it delicately.†
Chpt 2

coherent = sensible and clear; or describing parts as fitting together in a consistent or pleasing manner
the man's deep grief and frequent incoherent cries.
Chpt 2 *

incoherent = not understandable (unclear)

standard prefix: The prefix "in-" in incoherent means not and reverses the meaning of coherent. This is the same pattern you see in words like invisible, incomplete, and insecure.
That will bring her, he thought incoherently.†
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.

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.