flabby impressionability which is dignified under...........

[sb70012]

If personality is an unbroken series of successful gestures, then there was something gorgeous about him, some heightened sensitivity to the promises of life, as if he were related to one of those intricate machines that register earthquakes ten thousand miles away. This responsiveness had nothing to do with that flabby impressionability which is dignified under the name of the "creative temperament"—it was an extraordinary gift for hope, a romantic readiness such as I have never found in any other person and which it is not likely I shall ever find again.

Source: http://www.publicbookshelf.com/fiction/great-gatsby/younger-vulnerable-2

Hello friends,
I know the meanings of each word in the blue part but I can't understand it as a whole.
This is my paraphrase: "Weak easily influenced mood, serious and controlled under the name of the creative temperament"
I know the meanings but as a whole I can't get the goal of the blue part. Would you please be kind enough to
clarify it to me?

Thank you

 

[bhaisahab]

Source: http://www.publicbookshelf.com/fiction/great-gatsby/younger-vulnerable-2

Hello friends,
I know the meanings of each word in the blue part but I can't understand it as a whole.
This is my paraphrase: "Weak easily influenced mood, serious and controlled under the name of the creative temperament"
I know the meanings but as a whole I can't get the goal of the blue part. Would you please be kind enough to
clarify it to me?

Thank you

You are on the right track with "weak" and "easily influenced". Have a look at this definition of the verb "dignify": dignify verb - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online