Exhilarating = making you feel very excited and happy

an exhilarating walk in the mountains

An exhilarating sense of new beginning swept through him

At the end of the race I was exhilarated

Contrived = far-fetched

His excuse sounded a bit contrived

Dumbfounded = so shocked that you cannot speak
Synonym: thunderstruck

He was dumbfounded by the allegation

What to do with these swords?

1. Open Cambridge Dictionary (https://dictionary.cambridge.org/) and check how to use them one more time.
2. Find some examples form a website YouGlish (https://youglish.com/)
3. Watch the whole video to practise listening and to find more unknown words