(covers information from several alternate timelines)
The following is a list of unnamed languages.
Caretaker's epitaph language Edit
Cytoplasmic lifeform's language Edit
The language vocalized by the non-humanoid cytoplasmic lifeform encountered in the Delta Quadrant by the USS Voyager in 2375 was considered incredibly complex. The language consisted of a series of high pitched shrieks and screams. For humanoids, it was rather annoying and uncomfortable to listen to.
After Voyager received a message from this species, Captain Kathryn Janeway attempted to translate the language by instructing the computer to assign symbols to all the different tones in it, hoping to ascertain their meaning. There were over 10,000 different sounds in only one section of the message. In the end, the language proved indecipherable, its complexity far beyond the capabilities of the Federation to translate at the time of the encounter.
Enterprise-D nursery alphabet Edit
Flaherty's languages Edit
These languages, along with Romulan, Klingon, Giamon and Stroyerian, were spoken by Commander Flaherty as of sometime prior to 2365, according to Jean-Luc Picard. He mentioned it to William T. Riker that year when Riker inquired about the first officer of the USS Aries following his (ultimately rejected) appointment as the Aries's captain. (TNG: "The Icarus Factor")
Gosis' species language Edit
Makull's species language Edit
Manas' language Edit
In 2263 of the alternate reality, the fact that Nyota Uhura had only heard Krall use this language was responsible for her considerable surprise when he started to speak English to her. (Star Trek Beyond)
Nekrit supply station Edit
Nezu planet writing Edit
Swarm species language Edit
The language was so different from other known languages that it initially could not be translated by the universal translator. After some work on the UT by Harry Kim, a rough translation of the language became possible. A transmission in this language was roughly translated as "Too late...Should have listened." (VOY: "The Swarm")
Teenaxi symbols Edit
Webb's language Edit
George Webb was allegedly heard muttering in what was described as "some sort of alien language" following his contact with an escape pod from a Y-500 class freighter, according to Travis Mayweather. (ENT: "Strange New World")