The forms of the indefinite pronouns in question are samthing~jamjing and sambadi~jambadi~sambala~ jambala. These are regarded as analyzable as the components also recur in na-jing 'nothing', enijing 'anything', nobadi 'nobody', enibadi 'anybody', samwe 'somewhere', samtaim 'sometimes', etc.The suffix in the variant sam-bala is the general adjectival suffix in NPs referring to humans, thus its status would be comparable to English one.
Source: Angelo et al. 1998