All 3 Uses

coherent
in
Alas, Babylon
(Auto-generated)

All he heard was a distant and incoherent babble.†
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.
As before, the 640 channel brought only an incoherent jumble of distant voices, but Happy Hedrix was still broadcasting over WSMF, from San Marco, on 1240, although, obeying the Conelrad rules, he never mentioned the call sign.†
Chpt 5
Still, he was able to tell me, quite coherently, what had happened.†
Chpt 7

coherently = in a sensible and clear manner; or in a manner where parts fit together consistently or pleasingly

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.