de ‧ fen ‧ si ‧ ble /dɪˈfensəb ə l, dɪˈfensɪb 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 . a defensible opinion, idea, or action seems reasonable, and you can easily support it OPP indefensible :
a morally defensible prison system
2 . a defensible building or area is easy to protect against attack
—defensibly adverb