
Thief
Secrecy Key
The thief often acts without the owner's knowledge, emphasizing slyness and avoidance of detection. 
Negative Connotation
'Thief' carries a strong negative judgment and implicates dishonesty and criminal behavior. 
Type Significance
Differentiating 'car thief', 'pickpocket', or 'identity thief' specifies what the thief steals, adding clarity. 