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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