The difference between Invulnerable and Undefeatable
When used as adjectives, invulnerable means incapable of being injured, whereas undefeatable means not defeatable.
Undefeatable is also noun with the meaning: something that has an undefeatable quality.
check bellow for the other definitions of Invulnerable and Undefeatable
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Invulnerable as an adjective:
Incapable of being injured; not vulnerable.
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Invulnerable as an adjective:
Unanswerable; irrefutable
Examples:
"an invulnerable argument"
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Undefeatable as an adjective:
Not defeatable; impossible to defeat.
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Undefeatable as a noun:
Something that has an undefeatable quality.