What is a word for a quick thinker?

Related questions

1. What are each fingers called?
2. Does cracking knuckles make them bigger?
3. Is it bad to crack your back everyday?
4. Do toes have names like fingers?
5. Where does the saying bald as a coot come from?
6. Why you should not crack your knuckles?
7. What does it mean to fathom something?
8. What does the idiom sit on the fence mean?
9. What does beating around the bush mean?
10. Is it bad to crack your knuckles and neck?

Tags

1. #supersmart
2. #brilliant
3. #alert
4. #quick
5. #synonyms
6. #exceptional
7. #hyperintelligent
8. #nimble
9. #brainy
10. #smart
11. #witted
12. #ultrasmart
13. #bright
14. #sharp
15. #clever
16. #intelligent