The Collaborative International Dictionary of English v.0.48:

Thieve \Thieve\, v. t. & i. [imp. & p. p. Thieved; p. pr. &
   vb. n. Thieving.] [AS. ge[thorn]e['o]fian.]
   To practice theft; to steal.
   [1913 Webster]

WordNet (r) 3.0 (2006):

thieving
    adj 1: given to thievery [syn: thieving(a), thievish]
    n 1: the act of taking something from someone unlawfully; "the
         thieving is awful at Kennedy International" [syn:
         larceny, theft, thievery, thieving, stealing]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "thieving":
   brigandish, burglarious, fraudulent, kleptomaniac, larcenous,
   larceny, light-fingered, pinch, piratelike, piratic, purloining,
   steal, stealage, stealing, sticky-fingered, thievery, thievish,
   touch