WordNet sense 1 (serving no useful purpose; having no excuse for being):

otiose, superfluous, wasted

WordNet sense 2 (lacking in usefulness or value):

worthless

WordNet sense 3 (having a broad or rounded end):

blunt

WordNet sense 4 (not having a point especially a sharp point):

unpointed

WordNet sense 5 (lacking import):

purposeless, senseless

WordNet sense 6 (having no meaning or direction or purpose):

meaningless, nonmeaningful