Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

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