Modest just the same (10)

I believe the answer is:

unaffected

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'same' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I don't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for unaffected that I've seen is " Sincere, genuine".)

I've seen this clue in The Guardian.

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