Triumphalism (noun)

The attitude or behavior of someone who behaves as if they have won a great victory or achieved a great success, often in a way that is arrogant or dismissive of others.

Origin:

Derived from the latin word "triumphus" meaning triumph.

Examples:

1. The team's triumphalism after winning the game was off-putting to the opposing team.
2. The politician's triumphalism was a turn off to many voters.
3. The company's triumphalism was seen as arrogant by many of their competitors.
4. The country's triumphalism was a source of tension with other nations.
5. The individual's triumphalism was seen as a lack of humility.