Be puffed up with pride, etc.
Definition 1 of 1

Negative Tone
Usually implies negative judgement, suggesting excessive and unjustified pride.

After the debate, he was puffed up with pride, ignoring everyone's feedback.
Visual Imagery
Envision someone inflating like a balloon to understand how pride swells them.

She was puffed up like a peacock, flaunting her new designer dress at the party.
Not Always Visible
The pride may not be apparent to others, but felt strongly internally.

Despite his calm demeanor, he was puffed up with pride inside.
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