hello

The Thai word "สวัสดี" (sawatdi) is the universal greeting used to say hello. It originates from Sanskrit and carries a sense of well-wishing, essentially meaning "well-being" or "auspiciousness." When spoken, it is often accompanied by the "wai," a gesture where the palms are pressed together near the chest or face. While it is the standard way to greet someone, the register is adjusted by adding politeness particles at the end: "ครับ" (khrap) for males or "ค่ะ" (kha) for females. In very casual settings among close friends, people may sometimes shorten it or use informal greetings, but "สวัสดี" remains the most versatile and polite choice in any situation.
In conversation
Greeting a neighbor
สวัสดีครับคุณลุง
Hello, uncle.
สวัสดีจ้ะ ไปไหนมาล่ะ
Hello. Where have you been?
Using 'khrap' makes the greeting polite and respectful toward an elder.
Starting a phone call
สวัสดีค่ะ ติดต่อเรื่องงานค่ะ
Hello, I'm calling about the job.
สวัสดีครับ ได้ครับ เชิญพูดได้เลย
Hello, certainly. Please go ahead.
It is standard to use 'สวัสดี' even when you cannot see the person on the other end of the line.
Examples
สวัสดีตอนเช้าครับ
Good morning.
สวัสดีวันหยุด ขอให้มีความสุขนะครับ
Happy holiday, I hope you have a great one.
เราควรกล่าวคำว่าสวัสดีเมื่อพบปะผู้ใหญ่
We should say hello when meeting elders.