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Webster 1913 Edition

Noun.

Quality or state of being flabby.

Noun.

[See Flabby.] A soft, flexible state of a substance, which renders it easily movable and yielding to pressure.

flabbiness ‎(countable and uncountable, plural flabbinesses)

The characteristic or quality of being flabby
- Robert Louis Stevenson
  There were two, or perhaps three, flabbinesses of style which (in your work) amazed me. Am I right in thinking you were a shade bored over the last chapters?

being flabby