What is an unconscious behavior?

Unconscious behavior is a broad subject.

It can mean the person is unaware of their actions, their actions are unintended, involuntary, or they lack thought. Unconscious behaviors can arise from elements in your psychological make-up that result from memories, repressed desires, experiences and tendencies learned in childhood that form the underlying influences to behavior. It can also be simply something done without thinking.

An unconscious behavior may range from automatically removing your shoes before entering your own home because it was a rule of your mother's or feeling extremely anxious around certain sounds that you unconsciously connect to unpleasant experiences in the past. An unconscious behavior could be feeling uncomfortable around people of other races for no apparent reason.

See the related link for more information and a broader understanding.