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I have read in many places on the Internet that "yeah" is considered unprofessional. And that using "yes" is preferred and considered more formal. What is the reason behind it?

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Because it is informal and colloquial.

yeah adv. Informal Yes.

yeah American English, colloquial, by 1863, from drawling pronunciation of yes.


You can check this similar question as well:

When is it appropriate to use "Yeah" and "Yep" as variants of the word "Yes"?

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Because "yeah" is an informal and almost lazy way of saying yes. In yeah,you are not pronouncing the word yes correctly.

protected by MetaEd Jun 22 '18 at 20:58

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