| closed or secured with or as if with a seal | not open or affording passage or access |
| established irrevocably | (set theory) of an interval that contains both its endpoints |
| undisclosed for the time being | used especially of mouth or eyes |
| determined irrevocably | not open |
| apply a non-porous coating to something so as to ensure it is impervious | blocked against entry |
| covered with a waterproof coating | not open to the general public |
| (of walls) covered with a coat of plaster | with shutters closed |
| | requiring union membership |
| | not having an open mind |