1. Characterized by undue haste and lack of thought or deliberation
   "an impetuous display of spending and gambling"
   - hotheaded, impulsive, madcap, tearaway, brainish [archaic] 
2. Marked by violent force
   "impetuous heaving waves"

See also: forceful, impetuousness, incautious

Encyclopedia: Impetuous

• nonhierarchical
• nonhuman
• nonillion
• nonimitative
• nonimmune
• nonindulgence
• nonindulgent
• nonindustrial
• noninfectious
• noninflammatory
• noninheritable
• noninstitutional
• noninstitutionalised
• noninstitutionalized
• nonintegrated
• nonintellectual
• noninterchangeable
• noninterference
• nonintersecting
• nonintervention
• noninvasive
• nonionic
• nonionised
• nonionized
• nonjudgmental