Practice: face, jai yen and the hidden no
What you will be able to do
Hear the no inside a Thai maybe, keep your voice level when something goes wrong, and make the gentle second offer.
The culture runs on face and calm: never make someone lose face, stay ใจเย็น (cool-hearted), hear อาจจะ/ขอคิดดูก่อน/ไม่ว่าง as soft nos, and attach an escape hatch to every favour so a no is cheap to give.
เสียหน้า means…
เสียหน้า (sǐa-nâa) — to lose face. Causing someone else to lose face is the bigger offence; never correct or refuse a person in front of an audience.
รักษาหน้า — how do you save face for someone?
รักษาหน้า (rák-sǎa nâa) — save face. Give people a way out; raise problems later, one to one, framed as a question.
Someone says ใจเย็นๆ นะ to you. What does it mean?
ใจเย็นๆ นะ (jai-yen-yen ná) — easy, stay calm. If this is said to you, you have already gone too hot; drop your volume immediately.
ใจร้อน describes someone who is…
ใจร้อน (jai-ráwn) — hot-hearted, impatient. Once you are read as this, people stop helping and simply wait you out. The admired trait is ใจเย็น (jai-yen), cool-hearted.
At a counter when something goes wrong, the quiet-voice question is…
พอจะทำอะไรได้บ้างไหม (phaw jà tham à-rai dâi bâang mái) — is there anything that can be done? It presents you as a person with a case, not a disturbance.
เกรงใจ means…
เกรงใจ (greeng-jai) — reluctance to impose. It explains first refusals, unreported problems, and why a junior will not flag the hole in your plan.
ไม่ต้องเกรงใจนะ is said when…
ไม่ต้องเกรงใจนะ (mâi dtâwng greeng-jai ná) — no need to hold back. The standard second offer; say it while sliding the dish over or reaching for the bill.
On a concrete plan, อาจจะ (maybe) usually means…
อาจจะ (àat-jà) — maybe. On a concrete plan this usually means no; make a backup and do not push for certainty.
ขอคิดดูก่อนนะ is…
ขอคิดดูก่อนนะ (khǎw khít duu gàwn ná) — let me think it over first. It is a soft refusal, not a request for time.
ไว้ก่อนนะ means…
ไว้ก่อนนะ (wái gàwn ná) — let's leave it for now. Another packaged no; the topic rarely comes back unless you rebuild it from zero.
ไม่ว่าง with no counter-proposal is usually…
ไม่ว่าง (mâi wâang) — busy. Given without a counter-proposal ('busy, but how about Sunday?'), it is usually a polite no to the plan, not the date; do not keep offering new dates.
ถ้าไม่สะดวกก็ไม่เป็นไรนะ — why attach this to a favour?
ถ้าไม่สะดวกก็ไม่เป็นไรนะ (thâa mâi sà-dùak gâw mâi bpen rai ná) — if it's not convenient, no problem. The escape hatch: it makes a no cheap to give, so the real answer arrives fast.
แล้วแต่ (up to you) is usually…
แล้วแต่ (láew-dtàe) — up to you. Almost never true indifference; offer two options and read which one gets the warmer answer.
When there is a clear gap in seniority or wealth, the bill is paid by…
เลี้ยง (líang) — to treat, to pay for everyone. When there is a clear gap in seniority or wealth, the senior person pays; proposing an even split reads as cold accounting. Between equal friends, splitting is normal.
Common mistake
Raising your voice to force an outcome. The second you get loud at a counter or in a meeting, you stop being a person with a problem and become the problem. In Thailand the calmest person in the room is the one who wins.