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JLPT N2 Author: makara
Not only not X, but also not Y. Both can be good things, or both bad.
Not only is that route not difficult to navigate, (but) it is also not bumpy.
See also
Although he has come to the company, not only does he not work, but about all he's doing is chatting with the female employees
#6550 Author: makara

Not only is this paper towel not expensive, but I can use it a number of times, and it is handy.
#8699 Author: american57

Not only is she not able to sing songs well, but she can't play the piano, either.
#6810 Author: anna.kendall

Discussion and comments
The words and kanji on this web site come from the amazing dictionary files JMDict, EDICT and KANJIDIC. These files are the property of the Electronic Dictionary Research and Development Group , and are used in conformance with the Group's licence. The example sentences come from the projects Tatoeba and Tanaka Corpus. Kanji search by radicals is based on the Kradfile2 and Kradfile-u files containing radical decomposition of 13108 Japanese characters. Many thanks to all the people involved in those projects!