
Useless
Negative Connotation
Use 'useless' to express frustration or disappointment in something's performance. 
Unhelpful Efforts
Use 'useless' when someone's attempt to help has no positive outcome or makes no difference. 
Extent of Uselessness
Combine 'useless' with words like 'completely' or 'utterly' to stress the total lack of effectiveness. 