coherent

US /koʊˈhɪr.ənt/
UK /koʊˈhɪr.ənt/
"coherent" picture
1.

logical and consistent; able to be understood

:
He presented a coherent argument that was easy to follow.
The witness's story was not entirely coherent.
2.

(of a person) able to speak clearly and logically

:
After the accident, he was barely coherent.
She was too upset to be fully coherent.