Nothing but sweetness (4)
I believe the answer is:
love
This might be a double definition.
'nothing' is the first definition.
(I've seen this before)
'sweetness' is the second definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Maybe there's an association between them I don't understand?
'but' acts as a link.
Can you help me to learn more?
(Other definitions for love that I've seen before include "Adoration" , "Nothing for the Williams sisters?" , "Serenade" , "All you need, according to the song" , "Disappointing score" .)