untimely [ un- = not 不；timely a. & ad. 及时的，及时地→]I a. at a wrong time or season 不适时的，不合时宜的 / Snow in June is untimely. 六月下雪是不合时令的。II ad. too early or young 过早地/ Her death came untimely at 18. 她在18 岁的时候就过早去世了。

unreasonably [ un- = not 不；reasonably ad. 合情合理地→]ad. in a way that is not reasonable; foolishly; extremely 不讲道理地；不理智地；过分地/ A miser is unreasonably stingy. 守财奴都小气得不近人情。

unemployment [ un- = lack of 无；employment n. 就业→]n. lack of employment; being out of work 失业；失业状态 / Unemployment has become the top problem in the country. 失业巳成为该国的头号问题。 

unrest [ un-= lack of 无；rest n. 安静，安宁 →]n. lack of ease or quiet; disturbance or agitation 不安，不宁；动乱，骚动 / The lasting unrest in the area eventually led to a rebellion. 该地区持续的动荡不安终于导致一场暴动。

unbend [ un- = to undo 取消；bend v. 弯→“to undo that of bending取消弯曲的状态”→]v.① straighten弄直；伸直/ Can you unbend this crooked nail?你能将这根弯钉子弄直吗？②relax 放松，使松懈 / She unbent her mind after work by watching television. 做完工作，她看电视散散心。

untie [ un- = to undo 取消，tie v. 绑→“to undo that of tieing 取消捆绑的状态”→]v. undo a knot, etc. ; loose解开；放松/ Please untie the package.请解开包裹。