In a way that can be justified or supported by good reasons.
From defensible + -ly (English adverbial suffix). Following standard English word formation, the adjective defensible becomes the adverb defensibly, modifying verbs and other adjectives.
You can act defensibly but indefensibly—the same action flips meaning depending on context and whether your reasons hold up. This reveals how morality isn't absolute but depends on justification.
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