All 3 Uses

coherent
in
Growing Up, by Baker
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When my cousin Catherine's hand touched a red-hot wood stove, my grandmother seized her arm and with fingertips light as feathers stroked the blistering skin while murmuring an incoherent incantation in a trancelike monotone.†
Chpt 4 *

incoherent = not sensible or clear; or describing parts as not fitting together in a consistent or pleasing manner

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.
The weekend quickly turned into an incoherent jumble of dreamlike episodes.†
Chpt 15
In a moment she was making incoherent noises which I took to be the music of feminine ecstasy.†
Chpt 15

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.