The Collaborative International Dictionary of English v.0.48:

Laconize \Lac"o*nize\, v. i. [imp. & p. p. Laconized; p. pr. &
   vb. n. Laconizing.] [Gr. ?. See Laconic.]
   To imitate the manner of the Laconians, especially in brief,
   pithy speech, or in frugality and austerity.
   [1913 Webster]