This is the 375th most frequent Estonian word.
kiire
The Estonian word "kiire" means "fast" or "quick" in English.
Here, 'kiire' is an adjective describing the car as 'fast'.
See on väga kiire auto, see jõuab sihtpunkti kiiresti.
This is a very fast car, it reaches the destination quickly.
In this context, 'kiire' is an adjective used to describe someone as 'quick' or 'speedy'.
Palun ole kiire ja tule appi!
Please be quick and come help!
In this sentence, 'kiire' is used as a noun meaning 'a busy state'.