From Longman Dictionary of Contemporary EnglishRelated topics: Militaryindefensiblein‧de‧fen‧si‧ble /ˌɪndɪˈfensəbəl◂/ adjective1BAD BEHAVIOUR OR ACTIONStoo bad to be excused or defendedThe law is morally indefensible and in need of reform.2PMimpossible or very difficult to defend from militaryattack —indefensibly adverbExamples from the Corpusindefensible• For a side that prides itself on its parsimoniousnature, the case for the defence was frankly indefensible.• If the hearingsuncover some incontrovertibleevidence of corruption he could look like a defender of the indefensible.• The first proposalstruck us as scientifically dubious, and the second as intellectually indefensible.• There is no advantage to be gained by Opposition Members seeking to defend the indefensible.• Valdez knew the score -- the deal was indefensible.• We are forced to defend a system we know to be indefensible.• It is indefensible that in such a rich country so many people are poor.