dumb - stupid , not very bright.
Dummy - this is an Americanism, not used in British English - in British English, a dummy is what you give to a baby to calm them - Americans call these 'pacifiers'.
April 19, 2015
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They mean the same. Dummy is the softer version.
April 19, 2015
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Dumb is a descriptive word, Dummy is a noun (a stupid person), also what we call a 'pacifier' in Britain.
April 19, 2015
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I would make it as simplest as I can demonstrating the following examples:
It's a dumb donkey.
It's a dummy.
April 19, 2015
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Note that both of these words have standard meanings other than the colloquial sense of 'stupid'. 'Dumb' means speechless. And 'dummy' means an imitation of something used as a substitute - check out the phrases 'dummy run' and 'crash test dummy' for example.
April 19, 2015
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Mike
Language Skills
Chinese (Mandarin), English, French, Italian, Spanish