pronunciation - Why is 'worthy' pronounced with a /ði/ unlike 'healthy', 'wealthy' and 'stealthy'?


I don't know how 'worthy' came to be pronounced with a /ði/ whereas 'healthy', 'wealthy', 'stealthy' etc., are pronounced with a /θi/. I am aware that theories of pronunciation in English are far too complex and often seem illogical. But with a curious student in my front wanting to know why 'worthy' has the /ði/, my task becomes very difficult.


I would appreciate if you could let me in on something that might help.




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