The Collaborative International Dictionary of English v.0.48:

Inconsiderable \In`con*sid"er*a*ble\, a.
   Not considerable; unworthy of consideration or notice;
   unimportant; small; trivial; as, an inconsiderable distance;
   an inconsiderable quantity, degree, value, or sum. "The baser
   scum and inconsiderable dregs of Rome." --Stepney. --
   In`con*sid"er*a*ble*ness, n. -- In`con*sid"er*a*bly, adv.
   [1913 Webster]