optimistic与hopeful这两个形容词均可表示“充满希望的，乐观看”之意。

optimistic : 指性格乐观，对未来充满希望，有时抱有不切实际的幻想。

• in an optimistic mood
  以乐观的情绪
• She's not very optimistic about the outcome of the talks.
  她对会谈的结果不太乐观。
• They are cautiously optimistic that the reforms will take place.
  他们对是否实行改革表示审慎的乐观。
• We are now taking a more optimistic view.
  我们现在抱较乐观的看法。

hopeful : 着重有根据的希望，充满自信。

• I feel hopeful that we'll find a suitable house very soon.
  我对很快找到合适的房子抱有希望。
• He is not very hopeful about the outcome of the interview.
  他对面试的结果不抱很大希望。
• She is hopeful of returning to work soon.
  她希望很快回去工作。