Updated on March 16, 2024
| deep | Explorers unearthed ancient artifacts deep underground |
| polish | The Polish underground was a network of resistance organizations that operated during the German occupation of Poland during World War II. |
| communist | |
| french | The french underground is known for its vibrant and diverse arts scene. |
| revolutionary | |
| political | The political underground was a force to be reckoned with in the totalitarian regime. |
| dark | The dark underground was a place of mystery and danger. |
| german | The German underground was a powerful force in the resistance to Nazi rule. |
| urban | He lives in the urban underground |
| dutch | The Dutch underground has been a major force in the development of modern dance music. |
| nazi | |
| active | The earthquake was caused by active underground movement. |
| deeper | As we ventured deeper underground the darkness seemed to consume us. |
| sexual | |
| literary | The literary underground thrived in the dimly lit cafes and smoky clubs of the city. |
| soviet | The soviet underground was a vast network of resistance and subversion. |
| military | The military underground base was hidden deep beneath the surface. |
| criminal | The FBI was able to infiltrate the criminal underground and arrest the kingpin. |
| entire | The entire underground network was flooded after heavy rain. |
| live | Some ant species live underground |
| terrorist | The terrorist underground was uncovered by the FBI. |
| hidden | The hidden underground tunnels were discovered beneath the ancient city. |
| czech | The Czech underground has a long and storied history. |
| secret | Explorers discovered a secret underground cave system. |
| norwegian | The norwegian underground is a dangerous place. |
| safe | We took shelter in the safe underground bunker during the storm. |
| radical | |
| danish | The danish underground scene is vibrant and diverse. |
| russian | I was intrigued by the Russian underground and its vibrant and subversive culture. |
| cuban |
| cultural | The cultural underground of the city was a breeding ground for new ideas and artistic expression. |
| armed | The armed underground fought against the government's oppressive regime. |
| dead | The tunnels were dead underground |
| ukrainian | The Ukrainian underground has been active since the Russian invasion in 2014. |
| belgian | The belgian underground is a vibrant and exciting scene. |
| gay | She audited attendance at gay underground clubs in the Castro District. |
| nearest | The nearest underground is just a few minutes' walk away. |
| vast | The vast underground caverns extended for miles beneath the city. |
| illegal | Sophia was trained in the illegal underground fighting rings for years. |
| fascist | |
| wartime | During the wartime underground secret tunnels and hideouts provided refuge from the enemy. |
| nuclear | The explosion of a nuclear underground device is not the same as a nuclear explosion. |
| italian | "One of the most exciting bands to emerge from the Italian underground is the post-punk trio Not Waving." |
| socialist | The socialist underground was a force to be reckoned with in the early 20th century. |
| democratic | The Democratic underground is a liberal community website. |
| spiritual | The spiritual underground held secret meetings to discuss and practice their beliefs. |
| japanese | The japanese underground scene was vibrant in the 1980s. |
| intellectual | The intellectual underground is a vibrant and diverse community of thinkers, writers, and artists who challenge the prevailing orthodoxy. |
| hot | The hot underground made the miners sweat profusely. |
| alive | Creatures living alive underground serve as a food source for the creatures living above. |
| called | I called underground to ask for directions. |
| wing | |
| linguistic | The linguistic underground is a hidden world of language use that is not recognized by the mainstream. |
| occult | There is a strange occult underground |
| artistic | The artistic underground flourished in the city, providing a platform for emerging talents. |
| antifascist | The antifascist underground worked tirelessly to resist the oppressive regime. |
| available | There are numerous dining options available underground |
| leftist |
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