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Impetuous
Impulsive Flair
Impetuous suggests a lack of deliberation and hints at spontaneity that may seem exciting but imprudent. 
Negative Impression
When describing a person, 'impetuous' often carries a negative connotation, implying irresponsibility. 
Youthful Associations
'Impetuous' can evoke images of youthful energy and lack of experience, often outgrown over time. 