1.
If you are ~ of yourself, you lack confidence.
He made her feel hot, and awkward, and ~ of herself...
The evening show was terrible, with hesitant ~ performances from all.
? confident, sure
ADJ: usu v-link ADJ, oft ADJ of n
2.
If you are ~ about something, you feel uncertain about it.
Fifty-two per cent were ~ about the idea...
Scientists are becoming increasingly ~ of the validity of this technique.
? certain
ADJ: v-link ADJ, oft ADJ about/of n