| Answer | Crossword Clue |
|---|---|
| AIRBUILT | Lacking a solid foundation |
| underpinning | A solid foundation laid below ground level to support or strengthen a building |
| underpinnings | A solid foundation laid below ground level to support or strengthen a building |
| underpinned | Support (a building or other structure) from below by laying a solid foundation below ground level or by substituting stronger for weaker materials |
| underpins | Support (a building or other structure) from below by laying a solid foundation below ground level or by substituting stronger for weaker materials |
| UNBASED | Lacking a foundation |
| BUILTONSAND | Lacking a strong foundation, metaphorically |
