1.
If you are ~ of someone or something, you are frightened of them.
I’m certainly not ~ of him...
I was too ~ to move...
Why are you so ~?
= frightened
ADJ: usu v-link ADJ, oft ADJ of n, ADJ to-inf
2.
If you are ~ that something unpleasant might happen, you are nervous and worried because you think that it might happen.
I was ~ that I might be sick...
He was ~ of letting us down.
= worried
ADJ: usu v-link ADJ, oft ADJ that, ADJ of -ing