a.

1. 气喘吁吁的，呼吸困难的
   The climb made him breathless.

   往上爬使他上气不接下气。

2. （因兴奋、恐惧等）呼吸急促的；屏息的
   The children were breathless as they watched the tightrope act.

   孩子们在看走绳索表演时呼吸都屏住了。

3. 扣人心弦的，令人喘不过气的
   breathless tension

   令人透不过气来的紧张

4. 呼吸停止的；死的
   The body lay breathless on the bed: there was no sign of life.

   躺在床上的人停止了呼吸，已经死了。

5. 无风而沉闷的；闷气的
   the breathless air of a hot summer day

   炎热的夏日那令人窒息的空气

adj.

1. gasping for breath, typically due to exertion.
   ▸feeling or causing great excitement, fear, etc.
2. (of air) stiflingly still.