If someone is shrewish, they are bad-tempered and always complaining.
The word shrewish has a very negative feeling. It means someone is not nice to be around.
Examples:
She is always shrewish and never happy.
The shrewish woman yelled at everyone.
He doesn't like her because she is shrewish.
The cat looked shrewish when I tried to pet it.
The shrewish witch in the story was always making trouble.
The shrewish old man was always grumbling about something.