Verbosity n.; pl. Verbosities.
Etymology: [L. verbositas: cf. F. verbosité.]
The quality or state of being verbose; the use of more words than are necessary; prolixity; wordiness; verbiage. The worst fault, by far, is the extreme diffuseness and verbosity of his style. Jeffrey.
Shades of meaning
Fernald has no entry of its own for verbosity; he lists it under circumlocution.
Where he writes about it:
Verbosity and wordiness denote an excess of words in proportion to the thought. — from circumlocution