1.
If someone is being kept ~, they are not allowed to talk to anyone outside the place where they are.
He was held ~ in prison for ten days before being released without charge.
ADJ: usu v n ADJ
2.
If someone is ~, they do not want to be disturbed, or are in a place where they cannot be contacted.
Yesterday she was ~, putting the finishing touches to her autobiography...
ADJ: v-link ADJ