Being sincere is being genuine. If you've been offered a sincere thanks for something you've done, the person is probably really grateful. Sometimes when people say "thank you," they don't always mean it, but when they add the adjective sincere, the emphasis is usually for a very good reason.
Basically being sincere is being serious example if you mad and someone thinks your joking you can say I being sincere.
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Answer:
Being sincere is being genuine. If you've been offered a sincere thanks for something you've done, the person is probably really grateful. Sometimes when people say "thank you," they don't always mean it, but when they add the adjective sincere, the emphasis is usually for a very good reason.
Basically being sincere is being serious example if you mad and someone thinks your joking you can say I being sincere.
Explanation: