not physically connected or fastened to something

Helium is a colourless, odourless inert gas we associate most often with balloons that float skyward if left untethered. 氦气是一种无色无味的惰性气体，我们最常联想到的是气球，如果不拴住，气球就会飘向天空。

An untethered animal is not tied to anything, so that it is free to move in a large area.

The goats wandered untethered down the rough tracks. 山羊无拘无束地在崎岖的山路上游荡。

not staying or forced to stay in one particular place

The cell phone also better serves a more untethered community, especially recent immigrants who value portability over traditional landlines. 手机还能更好地服务于一个更加不受羁绊的社区，特别是那些重视便携性而非传统固定电话的新移民。