underreacts
/ˌʌndərriˈækts/
verb
- Third person singular of underreact; responds to a situation with less emotion or action than is appropriate or expected.
- She underreacts when people compliment her, as if she doesn't believe them.
- He always underreacts to bad news, which confuses his friends.
- The system underreacts to minor errors, so they go unfixed.