Understand spoken Thai

fastest

เร็วที่สุด
Fastest. The Thai for "fastest" is "เร็วที่สุด".

Acknowledgements

Image source
https://www.nicepik.com/cheetah-laying-down-big-cat-acinonyx-jubatus-mammal-zoo-san-antonio-zoo-cheetah-resting-on-ground-free-photo-1068853