It implies a dishonest intention to steal something that belongs to someone else.
Here are some examples of how you might use "larcenous" in a sentence:
* The detective suspected the employee's larcenous behavior after noticing discrepancies in the inventory.
* The museum security guards were on high alert, wary of any larcenous attempts to steal the priceless artifacts.
* The thief's larcenous acts left a trail of broken locks and empty wallets.
The word "larceny" is the noun form, meaning the crime of theft.