1. causing someone to feel less confident or enthusiastic; disappointing

1. present participle of deflate: removing air or gas from something inflated
2. present participle of deflate: reducing someone’s confidence or enthusiasm

Examples

• She was deflating the balloon after the party.
• The tire was slowly deflating overnight.
• His harsh criticism was deflating to the young artist.
• The deflating news about the project cancellation spread quickly.
• The coach’s deflating comments hurt the team’s morale.
• It was a deflating experience to lose the championship game.
• The deflating response from the audience disappointed the performer.