In the grammar structure 又 [adjective] 又 [adjective], is there anything wrong with combining a negative adjective with a positive one?
Question: In the grammar structure 又 [adjective] 又 [adjective], is there anything wrong with combining a negative adjective with a positive one


Yes, there's something wrong with combining a negative adjective with a positive one in the [又 [adjective A] 又 [adjective B] structure. 

The problem is -- You can't do that!

All the examples you made up are wrong. [又(A) 又 (B)] is equal to [(A) and (B)] in English. 


  (A) and (B) have to be both positive or both negative


Example:

(both positive)

[又(迅速)又(准确)] = [(fast) and (accurate)]

We don't say  "his punch is fast but accurate" in English ; We only say "his punch is fast and accurate"

~

(both negative)

[又(贪心)又(愚蠢)] = [(greedy) and (stupid)]

We don't say "this man is greedy but stupid" in English; We only say "this man is greedy and stupid"

~

(one positive, one negative)

[(迅速)但(不准确)] = [(fast) but (inaccurate)]

We don't say "his punch is fast and inaccurate" in English. For the same reason, we don't say "他的拳头又快速又不准确" in Chinese

[(贪心)但(守法)]= [(greedy) but (law abiding)]

We don't say "he is greedy and law abiding" in English. For the same reason, we don't say "他又贪心又守法" in Chinese