Describing character

My sister can't wait for anything; she's so ________.

I get very __________ before exams; I need to try and relax a bit more.

Adeline hasn't done a thing since she's been here. Honestly, she's so ________.

I always have a laugh with my cousin - he's got a great sense of _______.

1. My younger sister is able to understand new ideas so quickly; she's very ______.

If Sarah says she'll do it, then she'll do it. I _______ her completely.

He'd like to be relaxed and confident, but it's just not part of his _______.

He failed his exams, but he isn't _____. He just didn't do any work.

1. He has never bought me a drink in ten years. (Describe in one word)

She often promises to do things but sometimes she forgets. (Describe in one word)