insipidity

[Cf. F. insipidité.]
The quality or state of being insipid; vapidity. «Dryden's lines shine strongly through the insipidity of Tate's.» Pope.

noun

1. The state or quality of being insipid: blandness, innocuousness, insipidness, jejuneness, vapidity, vapidness, washiness, wateriness. Informal wishy-washiness. See excite/bore/interest, taste/bad taste.
2. A lack of excitement, liveliness, or interest: asepticism, blandness, colorlessness, drabness, dreariness, dryness, dullness, flatness, flavorlessness, insipidness, jejuneness, lifelessness, sterileness, sterility, stodginess, vapidity, vapidness, weariness. See excite/bore/interest.

The noun has one meaning:

Meaning #1: lacking any distinctive or interesting taste property
  Synonyms: blandness, insipidness