Synonym finder
Synonyms for underground
Related words are suggestions. Their meaning and tone can differ, so check the sentence before substituting one.
- surreptitious
- clandestine
- partisan
- secret
- irregular
- resistance
- cloak-and-dagger
- guerrilla
- hugger-mugger
- partizan
- tube
- undercover
- belowground
- hush-hush
- subsurface
- guerilla
- hole-and-corner
- on the quiet
- subway
- covert
- metro
Source: Datamuse API