Check an online thesaurus (like thesaurus.com) using Control-F (Find) key (spacebar-k).
nervous
Impressive...
jiggly
cool fun amazing
overwhelming, outrageous, outstanding
How about "Kopacetic"? Karl
Keep informed is a synonym for keep an eye on. Keep cool is a synonym for keep a stiff upper lip. Keep secret is a synonym for keep back or keep from. Know-how is a synonym for knowledge.
It is a synonym for awesome
awesome
a synonym for kindergarten is grade k
Overwhelming is a synonym for awesome. It begins with O.
There is no synonym for awesome beginning with the letter x.