IPA: /ˈθiːvɪʃnəs/
KK: /ˈθivɪʃnɪs/
The quality or condition of being inclined to steal or act like a thief.
His thievishness was evident when he tried to take the neighbor's bicycle without permission.
Thievishness is formed from "thievish" (from Old English "þēof", meaning thief) and "-ness" (meaning the state or quality of). The word describes the quality or state of being like a thief.
Think of the word 'thief' to remember that 'thievishness' refers to the quality of being like a thief.