What's the difference between these two adjectives?

[Aiken]

Dear all,

How's the difference between insincere and dishonest?

Thanks
Aiken
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Man proposes; God disposes

[Beeesneees]

http://www.oxfordadvancedlearnersdictionary.com/dictionary/insincere

"Her best wishes were insincere." - she didn't mean them.

http://www.oxfordadvancedlearnersdictionary.com/dictionary/dishonest

"He was a dishonest businessman." - he wasn't honest in his business dealings.
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Cheers m' dears!