D defs.my
Entry 2 senses Webster, 1913

Light-minded

/(līt"mīnd`ĕd)/ · Light·-mind·ed · IPA
01 a. Unsettled; unsteady; volatile; not considerate.
  1. 1.
    Unsettled; unsteady; volatile; not considerate.
  2. 2.
    showing inappropriate levity.
Syn. flippant.