unimportance

from WordNet (r) 3.0 (2006)

unimportance
    n 1: the state of being humble and unimportant [syn:
         {humbleness}, {unimportance}, {obscureness}, {lowliness}]
    2: the quality of not being important or worthy of note [ant:
       {importance}]

from The Collaborative International Dictionary of English v.0.48

Unimportance \Un`im*por"tance\, n.
   Want of importance; triviality. --Johnson.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

38 Moby Thesaurus words for "unimportance":
      daintiness, delicacy, diminutiveness, exiguity, exiguousness,
      fewness, homeliness, humbleness, humility, inconsequentiality,
      inconsiderableness, ingloriousness, innocuousness, insignificance,
      insufficiency, littleness, lowlihood, lowliness, meagerness,
      meanness, meekness, minuteness, moderateness, modesty, pettiness,
      picayunishness, plainness, poorness, puniness, scantiness,
      simpleness, slightness, smallness, submissiveness, teachableness,
      tininess, triviality, unpretentiousness