Axiomatic, obvious (4-7)
I believe the answer is:
self-evident
I believe this is a double definition.
'axiomatic' is the first definition.
(synonyms)
'obvious' is the second definition.
(I've seen this before)
(Other definitions for self-evident that I've seen before include "Not requiring further explanation" , "Needing no explanation" , "Not needing to be demonstrated" , "Not needing to be explained" , "Obvious" .)