involuntarily 

英汉解释

adv. 无心地；不自觉地；偶然地

反义词

r.   voluntarily

参考例句

1. Dream:A series of images, ideas, emotions, and sensations occurring involuntarily in the mind during certain stages of sleep.
梦：在睡眠的一定阶段在头脑中不自然地出现的一系列形象、想法、情感和感觉。
2. West Lake, flower and water, I think the most beautiful. That an enchanting scenery, involuntarily intoxicated, involuntary it printed in my mind!
西湖的花和水，我认为最美的。那一片妖娆的风景，不由自主地令人陶醉，不由自主的把它印在脑海里！
3. Involuntarily I glanced seaward—and distinguished nothing except a single green light, minute and far away, that might have been the end of a dock.
我也情不自禁地朝海上望去——什么都看不出来，除了一盏绿灯，又小又远，也许是一座码头的尽头。

英英解释

adv.
  1. against your will

网络释义

involuntarily
不情愿地，无意地; 无心地; 不由自主; 不情愿地，如果能使更少的家庭处于贫困之中，盗窃;
Involuntarily unemployed
非自愿失业;
insensibly involuntarily unawares unknowingly
不知不觉地;
cannot help doing involuntarily
身不由己;