1. A blithe [happy] heart makes a blooming visage. 

2. She shows a blithe disregard for danger.

3. A blithe heart makes a blooming visage.

4. It does so with blithe disregard for best scientific practice.

5. He drove with blithe disregard for the rules of the road.

6. Mary spoke with blithe certainty about her future.

7. When Claire left, the blithe people followed her.

7.

8. Nobody should be too blithe here either.

9. Around the conference centre, the party rocks on with blithe disregard for the economic and political turbulence beyond.

10. It heard blithe announcements from two military eminences which were hardly reassuring.

11. But this knowledge is not so easily acquired as blithe references to the problem might suggest.

12. Relieved to have grass underfoot silencing his blithe escape, Laverne glances back with all the charm of a lowly jackal.

13. Saconi was in there at one of the tables, blithe and ambivalent in the diffused natural light.

14. She wasn't the same Juliet Avery who had cycled to the hospital yesterday morning, blithe and carefree.

15. As for the promise to ban fox-hunting, it was given with such a blithe nonchalance as to be spine-chilling.

16. Meanwhile, rehearsals for Blithe Spirit were proceeding to their second week with me sitting on this bombshell.

17. The rooks cawed, and blither birds sang; but nothing was so merry or so musical as my own rejoicing heart.

18. If we could make it thrue the darkest Night we'd have a blither day.