madcap

Words with a similar base: madcap

'madcap'

[daredevil.n.01] as in: a reckless impetuous irresponsible person

'madcap'

[hotheaded.s.02] as in: characterized by undue haste and lack of thought or deliberation; ; ; ; ; (`brainish' is archaic)

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Examples:
a hotheaded decision
liable to such impulsive acts as hugging strangers
an impetuous display of spending and gambling
madcap escapades