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Defendable (adjective)
Capable of being defended.
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Defensible (adjective)
capable of being defended against armed attack
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Defensible (adjective)
capable of being justified
Wiktionary
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Defensible (adjective)
justifiable by argument
“a morally defensible penal system”
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Defensible (adjective)
able to be protected
“a fort with a defensible yard at its feet”
Oxford Dictionary