1. most intoxicating or exhilarating; causing the strongest feeling of excitement or euphoria
Usage: superlative form of ‘heady’
2. most impetuous or rash; showing the greatest lack of careful thought
Usage: superlative form of ‘heady’

Examples

• The victory celebration was the headiest moment of their championship season.
• She felt the headiest rush of adrenaline as she crossed the finish line first.
• The headiest perfumes in the garden came from the jasmine flowers.
• His headiest decision was to quit his job without having another one lined up.
• The headiest days of the stock market boom made many investors overconfident.
• The mountain air at that altitude was the headiest she had ever breathed.