形容詞 unlikely:

1. not likely to be true or to occur or to have occurred
   同義詞：improbable
2. has little chance of being the case or coming about
3. having a probability too low to inspire belief
   同義詞：improbable, unbelievable, unconvincing

1. Frost is possible, although unlikely, at this time of year.
   在一年中的這個時候，下霜也是可能的，雖然可能性并不大。
2. On the evidence of their recent matches it's unlikely the Spanish team will win the cup.
   從西班牙隊最近的比賽情況來看，他們難以在這一錦標賽中奪標。
3. He is very ill and unlikely to recover.
   他病得非常厲害，不大可能恢復健康了。
4. These tactics are unlikely to be helpful to you.
   這種方法對你未必有用。