N-UNCOUNT 短暂;转瞬即逝;无常 If you talk about the transience of a situation, you mean that it lasts only a short time or is constantly changing. 短暂;转瞬即逝;无常 [formal]
There is a sense of transience about her, a feeling that she has only stopped off here en route to another place.
她给人一种转瞬即逝的感觉,仿佛她只是在前往他处的途中在此略作停留。
...the superficiality and transience of the club scene. [+ of]