Not all harridans sound dry and uninteresting! (4)
I believe the answer is:
arid
'uninteresting' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for arid that I've seen before include "Without water" , "(Of an area) very dry" , "(Of land) very dry" , "(Of climate) dry" , "flat" .)