BLITHE

adjective Synonyms: merry,cheerful,jolly Jack Jr.'s blithe attitude towards destroying Candidos shelter was shocking.
 * Blithe**
 * 1) Showing a casual and cheerful indifference considered to be callous or improper.
 * 2) Happy or joyous.

no matter what happened to her she always maintained a blithe, and bubbly attitude towards life.