What does おめでたい (omedetai) mean?

Example sentences

• 結婚(けっこん)が決(き)まったとは、おめでたい話(はなし)ですね。

  So the marriage is settled — that's wonderful news, isn't it.

• 彼(かれ)はおめでたい性格(せいかく)で、何(なん)でも信(しん)じてしまう。

  He is naively credulous and believes anything right away.