Thief / Robber
Quick Answer
An illness, an angel of death, or someone who deceives you.
Classical Interpretation (Ibn Sirin)
In classical interpretation, a thief breaking into a house represents an illness entering the body. If the thief takes something away, it can signify the passing of someone in the house or a severe loss of wealth. If the thief leaves empty-handed, the sick person will recover. A known thief represents a deceptive friend or someone trying to learn your secrets.
Hadith Context
"The Prophet (PBUH) compared the worst type of thief to someone who steals from his own prayer (by not completing its bowing and prostration). (Musnad Ahmad)"