Lar"ce*nous*ly

from The Collaborative International Dictionary of English v.0.48

Larcenous \Lar"ce*nous\, a. [Cf. OE. larrecinos. See {Larceny}.]
   Having the character of larceny; as, a larcenous act;
   committing larceny. "The larcenous and burglarious world."
   --Sydney Smith. -- {Lar"ce*nous*ly}, adv.
   [1913 Webster]