A sympathetic remark is not good enough (3,3)
I believe the answer is:
too bad
'enough' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?
'a sympathetic remark is not good' is the wordplay.
'a sympathetic remark' becomes 'too' (I can't justify this - if you can you should give a lot more credence to this answer).
'is not good' becomes 'bad' (bad is the opposite of good).
'too'+'bad'='TOO BAD'
Can you help me to learn more?
(Other definitions for too bad that I've seen before include "That's regrettable, informally" , "Tough" , "I have no sympathy" , "What a pity, hard luck" , "Informally regrettable - excessively wicked" .)