Another word for unavailable

They said he was unavailable for comment, so I suppose he's a private person.

Unfortunately, however, the confusion engendered by a defective organization has long been a byword among the people; there is no printed catalogue, quantities of books are buried in packingcases and unavailable, the collection of foreign books is very poor, hardly any new works being purchased, and the building itself is quite inadequate and far from safe; but the site of a new one has now been purchased and the plans are agreed upon, so that eventually the whole collection will be transferred to more suitable quarters.

The statistics given are taken as far as possible from official returns, and where such are unavailable they have been carefully compiled from reliable data.

In his absence, it was too heart wrenching to even look, knowing he was unavailable and unable to help.

For Livingstone's purposes the route to the west was unavailable, and he decided to follow the Zambezi to its mouth.