The Collaborative International Dictionary
Light-mindedness
Light-minded \Light"-mind`ed\ (l[imac]t"m[imac]nd`[e^]d), a.
Unsettled; unsteady; volatile; not considerate.
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showing inappropriate levity. [WordNet sense 1]
Syn: flippant. [WordNet 1.5] -- Light"-mind`ed*ness, n.
Wiktionary
light-mindedness
n. the quality or state of one who is light-minded; lack of seriousness
WordNet
light-mindedness
n. inappropriate levity [syn: flippancy]