INDEFENS'IBLE, adjective [in and defensible, from defend.] 1. That cannot be defended or maintained. A military post may be indefensible A bad cause is indefensible 2. Not to be vindicated or justified. An improper action or indecent expression is indefensible
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI