1. lacking or showing a lack of due concern (Freq. 3) - spoke with blithe ignorance of the true situation • Similar to: unconcerned 2. carefree and happy and lighthearted (Freq. 1) - was loved for her blithe spirit - a merry blithesome nature - her lighthearted nature - trilling songs with a lightsome heart • Syn: blithesome, lighthearted, lightsome, light-hearted • Similar to: cheerful • Derivationally related forms: lightsomeness (for: lightsome), lightheartedness (for: lighthearted), blitheness