One who steals by entering houses through doors or windows left open or unfastened.(noun)
The Century Dictionary (Public Domain)
Use "sneak-thief" in a sentence
"When I opened up all I found was Eggy Edgworth, small-time burglar, sneak-thief, and copper's nark of this parish who didn't look much like Destiny."
"Bundy he said, you only sell shoes, your son is a sneak-thief, your daughters 'a flooze."
"So what was left but the common hazard of travel, the sneak-thief and killer loose in the wild places, ready to pull a man from his horse and bludgeon his head to pulp for the clothes he wore, let alone a splendid horse and a handful of jewellery?"