maintainable

conceivable defensible imaginable

able to hold water assertable believable credible defendable feasible rational reasonable supportable sustainable viable workable

unimaginable unthinkable

certain untenable

bearable endurable sufferable tolerable

arguable defensible justifiable plausible rational

believable condonable credible defendable excusable impregnable reliable secure sound strong trustworthy viable vindicable warrantable

unjustifiable unreasonable

irrational unbelievable untenable