Both Uses

coherent
in
Nine Princes in Amber
(Auto-generated)

She led me to her rooms, but discovered there that I had no money and was incoherent.†
Chpt 5 *

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.
I squeezed with all my remaining strength, mumbling half-coherent pleas.†
Chpt 5

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.