Words of the Day - reticence and insouciance

reticent:

1. Inclined to keep one's thoughts, feelings, and personal affairs to oneself. See Synonyms at silent.

2. Restrained or reserved in style.

3. Reluctant; unwilling.

[Latin reticns, reticent-, present participle of reticre, to keep silent : re-, re- + tacre, to be silent.]

insouciance:
Blithe lack of concern; nonchalance.