1) He isn't tall nor short.
2) He isn't tall or short.
#1 and #2 are exactly the same meaning?
If so, which sentence is more common?
3611785/ . Also good: 3) He's neither tall nor short. 4) He's of average height.
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Answered https://forum.wordreference.com/threads/not-nor-vs-not-or.3611785/.
Also good:
3) He's neither tall nor short.
4) He's of average height.