形容词

1. 轻率的；欠考虑的；漫不经心的
You use blithe to indicate that something is done casually, without serious or careful thought.

1. carefree and happy and lighthearted

e.g. was loved for her blithe spirit
a merry blithesome nature
her lighthearted nature
trilling songs with a lightsome heart

Synonym: blithesomelightheartedlightsomelight-hearted

2. lacking or showing a lack of due concern

e.g. spoke with blithe ignorance of the true situation