Injurious (7)
'injurious' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for adverse that I've seen before include "Dire" , "Contrary -- inauspicious" , "Hostile" , "Unfavourable to evaders" , "Inopportune" .)
'injurious' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for harmful that I've seen before include "Noxious" , "Half rum (anag.)" , "Injurious" , "Causing injury or damage, say poison or malice" , "Deleterious" .)
'injurious' is the definition.
(I know that injurious can be written as hurtful)
This is the entire clue.
(Another definition for hurtful that I've seen is " Upsetting, distressing".)