The Collaborative International Dictionary
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
a. Not given to heavy thoughts or thinking, frivolous, not serious.
WordNet
adj. showing inappropriate levity [syn: flippant]
Usage examples of "light-minded".
Vain of fugitive successes, O light-minded man, full of pleasure and of wealth, hast thou imagined that thou couldst suffice even to thyself?
Corbett or anyone else should be abroad, for it was a drizzling cold November night, and the streets were muddy, as only Winnipeg streets in the old days could be--none of your light-minded, fickle-hearted, changeable mud that is mud to-day and dust to-morrow, but the genuine, original, brush-defying, soap-and-water-proof, north star, burr mud, blacker than lampblack, stickier than glue!
See Ecclesiasticus xix: He that is quick to believe is light-minded, and shall be diminished.