Laughably inadequate (8)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
derisory
(Other definitions for derisory that I've seen before include "Ridiculously inadequate" , "Ridiculous and insulting" , "Deserving of scorn, not to be taken seriously" , "Ridiculously small" , "Showing scorn or ridicule" .)