D defs.my
Entry 1 sense Webster, 1913

Indefensible

/ĭnˌ-dĭf-ĕn'-səb-əl/ · In·de·fen·si·ble · IPA /ˌɪndɪfˈɛnsəbəl/
01 Not defensible; not capable of being defended, maintained, vindicated, or justified; unjustifiable; untenable; as, an indefensible fortress…
  1. 1.
    Not defensible; not capable of being defended, maintained, vindicated, or justified; unjustifiable; untenable; as, an indefensible fortress, position, cause, statement, etc.
    “Men find that something can be said in favor of what, on the very proposal, they thought utterly indefensible.” Burke.