The Collaborative International Dictionary of English v.0.48:

Indexterity \In`dex*ter"i*ty\, n. [Pref. in- not + dexterity:
   cf. F. indext['e]rit['e].]
   Lack of dexterity or readiness, especially in the use of the
   hands; clumsiness; awkwardness. --Harvey.
   [1913 Webster]