pointlessly

Entry Definition
s/he talks to no purpose, blathers
pointlessly, for no apparent reason, without purpose, to no effect, in vain; falsely, fraudulently; (animal, plant) wild; (being, spirit) supernatural; (commerce) without cost, free, gratis
s/he makes it to no purpose (e.g., prospective buyer fails to pay for it)
for no purpose, pointlessly
s/he does something to h/ for no good reason; s/he makes h/ (cake, shirt, etc.) for no good reason or to no purpose; s/he accuses h/ falsely
s/he goes there without accomplishing anything
s/he walks to no purpose, pointlessly, for nothing, without accomplishing anything; s/he roams aimlessly, wanders randomly