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Explanation: Sawaddee Krab : for male speaker, rather formal
Sawaddee Kra : for female speaker, rather formal
Sawaddee ja : for female speaker , friendly
For a more friendly greeting, try...
Sabai dee paw = How are you ?
Gin kaw ma yang = Have you eat a meals ?
Pai nai ma lah= Where 've you gone ?
Explanation: Sawasdee is the general "greeting" term, covering both formal and informal greetings. You can use it at any time of day (or night).
You can also use particles khrap(used by male)or kha(used by female) ie. sawasdee khrap/sawasdee kha to make it sound polite.