This is the 4293rd most frequent French word.
excessive
Going beyond what is reasonable or necessary; too much.
Here, "excessive" describes the quantity of money spent, indicating that it is unreasonably or disproportionately high.
Elle dépense une somme excessive pour des vêtements chaque mois.
She spends an excessive amount on clothes each month.
In this context, "excessive" characterizes the intensity of heat, meaning it goes beyond the usual or tolerable level.
La chaleur excessive de cet été a rendu les journées difficiles.
The excessive heat of this summer made the days challenging.
For this usage, "excessive" refers to the degree of his confidence, suggesting it surpasses what might be considered appropriate or reasonable.