you blink, talk, and sneeze, and yawn etc.
Answer
Breathe.
Autonomous
To do without thinking
habit
This can not to be answered without something to choose from.
A natural habbit is something you do alot mostly without thinking.
To "jump into something without thinking" means you have reacted too quickly to something without first considering the consequences of your actions.
Inconsiderate.
A few things i can think of are breathing and blinking
The idiom "I lost my head" means that someone acted impulsively or irrationally, often due to strong emotions or stress, without thinking things through carefully. It suggests making a hasty decision or saying something out of anger.
Aloofness is a state of being reserved, distant, or emotionally detached from others. It can be perceived as cold or indifferent behavior, where someone keeps their emotions or thoughts to themselves and avoids close social interaction.
Impulse is the want to do something without thinking about it. Many people do thinks because they have an impulse to do so.
Indiscriminate means to do something randomly or without careful judgment. An example would be doing a crime without thinking about what would happen.
reflex behavior
It's when you buy something immediatley, without thinking about it such as the long term affects or how you might use it.