in ‧ de ‧ fen ‧ si ‧ ble /ˌɪndɪˈfensəb ə l◂, ˌɪndɪˈfensɪb ə l◂/ BrE AmE adjective
[ Word Family: noun : DEFENCE/DEFENSE , ↑ defendant , ↑ defender , ↑ defensiveness ; adjective : DEFENCELESS/DEFENSELESS , ↑ defensible ≠ ↑ indefensible , ↑ defensive ; adverb : ↑ defensibly ≠ ↑ indefensibly , ↑ defensively ; verb : ↑ defend ]
1 . too bad to be excused or defended:
The law is morally indefensible and in need of reform.
2 . impossible or very difficult to defend from military attack
—indefensibly adverb