| Unterkleid | slip |
| Unterleib | abdomen alvus |
| Unterhemd | undershirt |
| Federkleid | plumage |
| Unterdeck | lower deck |
| Unterstand | cabana refuge |
| Untertanin | subject |
| Unterwerk | substation |
| Unterzeile | subheadline |
| unterer | lower |
| untergehend | setting |
| Untergrund | bedrock (geol.) subfloor subgrade (constr., tech., geol.) subsoil substrate substratum base basis footing ground base coat (paint etc.) base material surface undercoat (paint etc.) underground |
| Unterkiefer | mandible lower jaw |
| Unterklasse | subclass |
| Unterkunft | accommodation lodging |
| Unterlage | base pad underlay document paper root-stock |
| Unterlauf | lower reaches |
| Unterling | underling |
| Untermenü | submenu |
| Unterpfand | pledge |