supportable
adjective
uk/səˈpɔːtəbl̩/ us/-ˈpɔːrṱə-/able to continue without problems:
Growth in the value of all company shares increased by 4.5% last year, nearly double the pace supportable in an economy growing at 2.5%.
that can be shown to be true, or that people can accept:
This position is no longer supportable in the present economic climate.