How to say “Fast” in Thai
เร็ว
reo
“fast”
“Fast” in Thai is เร็ว, written reo in the Latin alphabet.
Tone
เร็ว carries a mid tone — level, no movement. Thai uses tone to tell words apart, so the pitch is part of the word, not an accent you can drop.
The shortest way in is an English intonation you already use. Say “Yeah.” out loud — bored and flat, your voice at rest and going nowhere — then say เร็ว with that same shape.