WordNet sense 1 (dependent upon or characterized by chance):

hit-or-miss

WordNet sense 2 (lacking any definite plan or order or purpose; governed by or depending on chance):

random

WordNet sense 3 (without care; in a slapdash manner):

haphazardly

WordNet sense 4 (marked by great carelessness):

slapdash, slipshod, sloppy

WordNet sense 5 (marked by lack of attention or consideration or forethought or thoroughness; not careful):

careless