without thinking

• instinctiveArising without conscious thought
• impulsiveActing without deliberation
• automaticOperating without intervention
• reflexiveDirected back at subject
• spontaneousArising without external cause

reckless · careless · mindless · unthinking · snap · gut · impulse · knee-jerk · hasty · rash · autopilot · thoughtless · unconscious · blurt · react · leap · muscle memory · habit

• impulsive actionsspur of the moment, on a whim, snap decision, knee-jerk reaction, rush in
• autopilot modeautopilot, automatic, unconscious, subconscious, instinctively