Adjective:

1. of or characteristic of or occurring in autumn;

   "the autumnal equinox"
   "autumnal fruits"
   

2. characteristic of late maturity verging on decline;

   "a serene autumnal mood"
   

vernaladj.春天的；青春的；春天般清新的

wintryadj.冬天的；冷漠的

summeryadj.夏的；夏天似的

1. The day was warm, autumnal, and rainy.
   时值温和的细雨濛濛的秋天。
2. I feel a little cool in the autumnal night.
   在秋天的晚上，我感到一丝凉意。
3. The weather in June was positively autumnal.
   那六月的天气真像秋天似的。