having or showing a lack of serious purpose, attitude, etc.; frivolous; trifling: to be in a light-minded mood.

Origin of light-minded

First recorded in 1605–15
Related formslight·mind·ed·ly, adverblight-mind·ed·ness, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for light-minded

Historical Examples of light-minded