Practice: who to wai
What you will be able to do
Decide who you wai, who you answer with a nod, and how high your hands go — the judgement, not the gesture.
Three heights: chest for peers, thumbs to the nose for elders and anyone above you, thumbs between the eyebrows for monks and the Buddha. The junior wais first and the senior returns something smaller. You do not initiate to children or to service staff; a nod and a smile answers them.
How high?
a Thai friend your own age
Chest level: fingertips at the chest, thumbs roughly at the chin. That is the peers-and-equals floor, and it is your default everywhere — hands stay at the chest unless the person in front of you is clearly senior.
How high?
your partner's mother, meeting her for the first time
Raise the hands until the thumbs touch the nose. Anyone above you — elders (ผู้ใหญ่, phûu-yài), your child's teacher, your partner's parents, your boss — takes that height, and meeting your partner's parents is one of the moments you should certainly initiate.
How high?
พระ
phrá, a monk. The top floor — thumbs between the eyebrows, fingertips at the forehead — belongs to monks, the Buddha image at the temple (วัด, wát) and royalty. You will not use it on any layperson.
What do you do?
the 7-Eleven cashier wais you as she hands back your change
That is a service wai, a company script, not a personal greeting. Returning a full wai forces her into an awkward loop and marks you as someone performing a gesture without understanding it. The nod, the smile and ขอบคุณครับ (khàwp-khun khráp) is the whole correct answer.
Do you wai first?
a neighbour's child, about six, on the stairs
You never initiate a wai to a child. Children (เด็ก, dèk) wai you first, and waiing a small child first says something you did not mean to say. Nod or smile back, exactly as you would answer a service wai.
Who wais first?
you are introduced to a man clearly twenty years your senior
The junior person wais first and the senior answers with a รับไหว้ (ráp-wâi), smaller and lower than the one he received. Being introduced to anyone visibly older in a social setting is one of the moments you initiate.
What does it look like?
รับไหว้
ráp-wâi is the returned wai, deliberately smaller and lower than the wai it answers: often just hands at the chest, sometimes only a nod. The shrinking is the point — returning one at equal height would deny the status gap and embarrass both sides.
What has happened?
you wai a monk and he does not wai back
Nothing has happened. A monk never wais back, not to you, not to a ninety-year-old, at most a nod. Monks sit at the top of the ladder, so do not read it as rudeness and do not wait for it.
What do you do?
your partner's father greets you while you are carrying a toddler
Do not juggle. Press the palms together as far as the toddler allows and bow the head, or simply bow the head with the spoken greeting. The nod plus sà-wàt-dii khráp is a fully legitimate substitute, and Thais use it constantly themselves.
Wai again?
you waied your partner's parents on arrival; now you are heading out of the door
The same people you wai on arrival get one when you leave: your partner's parents as you head out of the door, the teacher at the end of the meeting, the host as you leave dinner. Skipping the departure wai after giving the arrival one reads as leaving in a hurry or a huff; the pair belongs together.
Which wai goes with it?
you clip a stranger your own age with your bag on the BTS and say ขอโทษครับ
khǎw-thôot khráp with a chest-level wai repairs a scrape in traffic or a spilled drink far better than words alone. Chest is your default here; go to the nose only for the clearly senior, and never to the forehead for a layperson.
What is that?
your taxi driver lifts one hand from the wheel as you pass a shrine
Thais wai shrines, spirit houses and temple gates, and drivers lift a hand at every shrine along the route. That is a nod to the sacred, not a greeting; nobody expects you to copy it, just do not mistake it for someone waving at you.
How much waiing?
young colleagues in a Bangkok office
In Bangkok young people barely wai each other, but the gesture has not gone: it survives between generations, at work rituals and in service scripts, and office juniors might wai the boss on first meeting and at the New Year rather than daily. In the provinces it is more alive, and an elder there registers your wai, or its absence, more keenly.
What do you do?
you cannot tell whether the man in front of you outranks you
When in doubt, do not initiate. Nobody minds a missed wai, because Thais do not expect foreigners to have the map, but everybody notices a wrong one: a wrong wai is not neutral, it makes a status claim. Answer what comes at you with a nod and a smile, and save your wais for the clearly senior.
Common mistake
Returning a full wai to service staff, the cashier, the porter, the hostess, whose wai is part of the job. A nod back is never wrong; a deep wai downward almost always is. And when you cannot place someone, do not initiate: nobody minds a missed wai, everybody notices a wrong one.