To express stronger uncertainty what word is correct, Perhaps or probably?
Perhaps I was wrong
Probably you were right
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With the example you give, they express equal uncertainty. How you say it changes the meaning a lot.
PERhaps I was wrong = I was not wrong
Perhaps I WAS wrong = I might have been wrong
Probably you were riGHT? = You might have been right
Probably you WERE right = You were right
In general, however, perhaps is more uncertain than probably.
(I'd say perhaps is 50% certain and probably is 90% certain, but others might disagree.)