Even seasoned opera singers, who otherwise affect an unflapabble air can be daunted by performing in the rome.
here, what I understand that even a professional singer who is very calm and poise can be afraid of performing in the rome. but my problem is here what ``otherwise`` means??
reference- manhattan gre book
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I think you mean:
"Even seasoned opera singers, who otherwise affect an unflappable air, can be daunted by performing in Rome."
The sense here is: "Even experienced opera singers, who, in any other venue (London, New York, Paris, Berlin, etc.) perform with a calm and poised air, can be unnerved by performing in Rome."