Sourly
/ˈsaʊərli/
Definition 1 of 2
Pro Tip 1/3Negative Emotion
Use 'sourly' to describe someone's expression when they are upset or annoyed. 
She commented sourly on the long delay.
Pro Tip 2/3Disapproving Tone
Shows someone’s negative opinion or rejection of something. 
He spoke sourly of the new policy at work.
Pro Tip 3/3Sarcasm Hint
Sometimes indicates that a laugh or a smile is insincere or hiding true feelings. 
She gave a sourly chuckle at the proposal.