Definitions

Obligation--

1. something by which a person is bound or obliged to do certain things, and which arises out of a sense of duty or results from custom, law, etc.

Annoying--
Causing vexation or irritation; troublesome: an annoying cough.

Captivating (adj.; captivate--v.)--

1. To attract and hold by charm, beauty, or excellence.
2. Archaic To capture.

Confident--

1. having strong belief or full assurance; sure.

All the definitions are from dictionary.com.