Glad, Happy
A woman is rejoicing. She must be glad and happy to rejoice out loud in front of you like this.
Picture a woman rejoicing loudly. She's got a big smile on her face and she wants you and everyone else to see how glad she is.
き
うれ
None
"I'm so glad!" the woman shouts, "Because I found the key (き)!" You immediately start to wonder what "the key" is. The key to life? The key to learning Japanese? Then you see she's holding up some car keys.
You'd be happy too if you'd just found your lost keys. Though maybe you wouldn't shout it for the entire world to hear.