Silly how love and hate both end (5)
I believe the answer is:
inane
'silly' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for inane that I've seen before include "Devoid of intelligence" , "Daft" , "Silly or senseless" , "Fatuous, mindless" , "Really stupid" .)