Reckless : heedless of danger or the consequences of one's actions; rash or impetuous. Indifferent : having no particular interest or sympathy; unconcerned. Careful : making sure of avoiding potential danger, mishap, or harm; cautious. Imprudent : not showing care for the consequences of an action; rash. Lenient : (of a punishment or person in authority) more merciful or tolerant than expected.