Other than supposed; different.
He said he didn’t do it, but the evidence was otherwise.
(manner) Differently, in another way.
Could I do otherwise than smile?.
In different circumstances; or else.
I’m not well today, otherwise I would have helped. You have to open your umbrella, otherwise you'll get wet.
In all other respects.
He lost his temper once in a while. Otherwise he behaved rationally.