different between supposedly vs believably

English

supposed +? -ly

supposedly (not comparable)

As a matter of supposition; in the beliefs or according to the claims of some people.
People from other planets have supposedly visited Earth in flying saucers.
According to your testimony, you were supposedly at home watching TV when the murder occurred.
- 2011, Tom Fordyce, Rugby World Cup 2011: England 12-19 France [1]
  France were supposedly a team in pieces, beaten by Tonga just a week ago and with coach Marc Lievremont publicly berating his players, but so clear-cut was their victory that much of the atmosphere had been sucked from the contest long before the end.

believable +? -ly

believably (comparative more believably, superlative most believably)

In a believable way.
He acted the part believably.
Used to express the speaker's assessment of the credibility of a reported statement.
Believably, Mikey said John pushed him first.

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